{"product_id":"bluelab-ph-ec-combo-pen","title":"Bluelab OnePen","description":"\u003ch2 dir=\"auto\" class=\"PDq2pG_selectionAnchorContainer\"\u003e\n\u003cspan role=\"text\"\u003e\u003cstrong\u003eBluelab OnePen pH, EC \u0026amp; Temperature Meter – 3-in-1 Hydroponic Nutrient Tester\u003c\/strong\u003e\u003c\/span\u003e\u003cspan class=\"PDq2pG_selectionAnchor\"\u003e\u003c\/span\u003e\n\u003c\/h2\u003e\n\u003cp dir=\"auto\"\u003eThe \u003cstrong\u003eBluelab OnePen\u003c\/strong\u003e combines three essential nutrient-solution measurements into one professional handheld meter: \u003cstrong\u003epH, electrical conductivity (EC) and temperature\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp dir=\"auto\"\u003eDesigned for hydroponics, coco, fertigation, indoor growing and horticulture, the OnePen lets you check \u003cstrong\u003epH and EC simultaneously\u003c\/strong\u003e instead of swapping between separate meters. It features high-resolution readings, automatic temperature compensation, a waterproof IP68 design and a \u003cstrong\u003ereplaceable pH\/EC\/temperature probe\u003c\/strong\u003e for improved long-term serviceability.\u003c\/p\u003e\n\u003cp dir=\"auto\"\u003eBuilt-in Bluetooth connectivity also integrates the OnePen with \u003cstrong\u003eEdenic by Bluelab\u003c\/strong\u003e, allowing compatible devices to display live measurements, save data and maintain measurement records.\u003c\/p\u003e\n\u003cp dir=\"auto\"\u003eFor growers who regularly check nutrient tanks, feed solutions, source water and runoff, the Bluelab OnePen provides a convenient all-in-one upgrade.\u003c\/p\u003e\n\u003ch2 dir=\"auto\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong\u003eKey Features\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003e3-in-1 pH, EC and temperature meter\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003eSimultaneous \u003cstrong\u003epH + EC measurement\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eMeasures pH from \u003cstrong\u003e0.00–14.00\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eHigh-resolution \u003cstrong\u003e0.01 pH\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eMeasures EC from \u003cstrong\u003e0.00–10.00 mS\/cm\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eHigh-resolution \u003cstrong\u003e0.01 EC\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eMeasures temperature from \u003cstrong\u003e0–50°C\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eAutomatic Temperature Compensation\u003c\/li\u003e\n\u003cli\u003eConductivity displayed as \u003cstrong\u003eEC, mS\/cm, CF, ppm 500 or ppm 700\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eReplaceable sensor probe\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003eDouble-junction pH probe\u003c\/li\u003e\n\u003cli\u003eDurable titanium EC electrodes\u003c\/li\u003e\n\u003cli\u003eBuilt-in probe health indicator\u003c\/li\u003e\n\u003cli\u003eBright backlit display\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eIP68 waterproof and dustproof\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003eTwo-point pH calibration\u003c\/li\u003e\n\u003cli\u003eBluetooth connectivity\u003c\/li\u003e\n\u003cli\u003eCompatible with \u003cstrong\u003eEdenic by Bluelab\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003ePowered by \u003cstrong\u003e2 × AAA alkaline batteries\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eCompact handheld design\u003c\/li\u003e\n\u003cli\u003eDesigned for nutrient solutions, water and runoff\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e2-year limited OnePen warranty\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 dir=\"auto\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong\u003eThree Essential Measurements in One Pen\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp dir=\"auto\"\u003eSuccessful nutrient management depends on more than simply mixing fertiliser with water.\u003c\/p\u003e\n\u003cp dir=\"auto\"\u003eThree measurements provide growers with particularly useful information:\u003c\/p\u003e\n\u003ch3 dir=\"auto\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong\u003epH\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp dir=\"auto\"\u003epH measures how acidic or alkaline your solution is.\u003c\/p\u003e\n\u003cp dir=\"auto\"\u003eMaintaining an appropriate pH range helps keep nutrients available for uptake by the plant.\u003c\/p\u003e\n\u003ch3 dir=\"auto\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong\u003eEC – Electrical Conductivity\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp dir=\"auto\"\u003eEC provides an indication of the concentration of dissolved ionic salts within your nutrient solution.\u003c\/p\u003e\n\u003cp dir=\"auto\"\u003eIt allows growers to monitor nutrient strength rather than relying solely on the amount of fertiliser added.\u003c\/p\u003e\n\u003ch3 dir=\"auto\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong\u003eTemperature\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp dir=\"auto\"\u003eNutrient-solution temperature influences the root-zone environment and also affects measurement accuracy.\u003c\/p\u003e\n\u003cp dir=\"auto\"\u003eThe OnePen measures all three parameters using a \u003cstrong\u003esingle replaceable probe assembly\u003c\/strong\u003e.\u003c\/p\u003e\n\u003ch2 dir=\"auto\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong\u003eSimultaneous pH \u0026amp; EC Readings\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp dir=\"auto\"\u003eA major advantage of the Bluelab OnePen is its ability to display \u003cstrong\u003epH and conductivity at the same time\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp dir=\"auto\"\u003eAvailable measurement modes include:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eEC + pH\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003epH + Temperature\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eEC + Temperature\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003emV + Temperature\u003c\/strong\u003e when enabled through Edenic\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp dir=\"auto\"\u003eFor routine reservoir checks, this means you can immerse one meter and quickly see the two measurements most growers adjust when mixing nutrients.\u003c\/p\u003e\n\u003ch2 dir=\"auto\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong\u003eHigh-Resolution pH Measurement\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp dir=\"auto\"\u003eThe OnePen measures across a \u003cstrong\u003e0.0–14.0 pH range\u003c\/strong\u003e.\u003c\/p\u003e\n\u003ch3 dir=\"auto\"\u003epH Specifications\u003c\/h3\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eRange:\u003c\/strong\u003e 0.0–14.0 pH\u003cbr\u003e\u003cstrong\u003eResolution:\u003c\/strong\u003e 0.01 pH\u003cbr\u003e\u003cstrong\u003eAccuracy at 25°C:\u003c\/strong\u003e ±0.05 pH\u003c\/p\u003e\n\u003cp dir=\"auto\"\u003eThe \u003cstrong\u003e0.01 pH resolution\u003c\/strong\u003e provides detailed readings for growers who want more precise visibility when adjusting nutrient solutions.\u003c\/p\u003e\n\u003ch2 dir=\"auto\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong\u003eEC, CF, TDS \u0026amp; PPM Measurement\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp dir=\"auto\"\u003eDifferent nutrient manufacturers and growers use different conductivity scales.\u003c\/p\u003e\n\u003cp dir=\"auto\"\u003eThe OnePen supports:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eEC\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003emS\/cm\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eCF\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eppm 500 \/ TDS\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eppm 700\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp dir=\"auto\"\u003eThis means you can select the measurement system that matches your nutrient schedule instead of manually converting between different scales.\u003c\/p\u003e\n\u003ch3 dir=\"auto\"\u003eConductivity Specifications\u003c\/h3\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eEC \/ mS\/cm:\u003c\/strong\u003e 0–10.00\u003cbr\u003e\u003cstrong\u003eResolution:\u003c\/strong\u003e 0.01\u003cbr\u003e\u003cstrong\u003eAccuracy:\u003c\/strong\u003e ±0.1\u003c\/p\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eCF:\u003c\/strong\u003e 0–100\u003cbr\u003e\u003cstrong\u003eResolution:\u003c\/strong\u003e 0.1\u003cbr\u003e\u003cstrong\u003eAccuracy:\u003c\/strong\u003e ±1\u003c\/p\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eppm 500:\u003c\/strong\u003e 0–5000 ppm\u003cbr\u003e\u003cstrong\u003eResolution:\u003c\/strong\u003e 10 ppm\u003cbr\u003e\u003cstrong\u003eAccuracy:\u003c\/strong\u003e ±50 ppm\u003c\/p\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eppm 700:\u003c\/strong\u003e 0–7000 ppm\u003cbr\u003e\u003cstrong\u003eResolution:\u003c\/strong\u003e 10 ppm\u003cbr\u003e\u003cstrong\u003eAccuracy:\u003c\/strong\u003e ±70 ppm\u003c\/p\u003e\n\u003cp dir=\"auto\"\u003eAccuracy specifications apply at 25°C.\u003c\/p\u003e\n\u003ch2 dir=\"auto\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong\u003eAutomatic Temperature Compensation\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp dir=\"auto\"\u003eTemperature can influence pH and conductivity measurements.\u003c\/p\u003e\n\u003cp dir=\"auto\"\u003eThe Bluelab OnePen incorporates \u003cstrong\u003eAutomatic Temperature Compensation (ATC)\u003c\/strong\u003e to compensate its measurements according to the temperature of the solution.\u003c\/p\u003e\n\u003cp dir=\"auto\"\u003eIt also displays the actual solution temperature in either:\u003c\/p\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003e°C or °F\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch3 dir=\"auto\"\u003eTemperature Specifications\u003c\/h3\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eRange:\u003c\/strong\u003e 0–50°C \/ 32–122°F\u003cbr\u003e\u003cstrong\u003eResolution:\u003c\/strong\u003e 0.1°C \/ 0.1°F\u003cbr\u003e\u003cstrong\u003eAccuracy:\u003c\/strong\u003e ±1°C \/ ±1°F at 25°C\u003c\/p\u003e\n\u003ch2 dir=\"auto\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong\u003eReplaceable pH, EC \u0026amp; Temperature Probe\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp dir=\"auto\"\u003eOne of the strongest features of the OnePen is its \u003cstrong\u003ereplaceable probe assembly\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp dir=\"auto\"\u003epH probes are electrochemical sensors and naturally age with use. With some handheld meters, the entire device eventually needs replacing when the sensor reaches the end of its useful life.\u003c\/p\u003e\n\u003cp dir=\"auto\"\u003eThe OnePen takes a more serviceable approach.\u003c\/p\u003e\n\u003cp dir=\"auto\"\u003eIts combined \u003cstrong\u003epH, EC and temperature probe can be replaced separately\u003c\/strong\u003e, allowing the main meter to remain in service.\u003c\/p\u003e\n\u003cp dir=\"auto\"\u003eThe replacement probe incorporates:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eDouble-junction pH sensor\u003c\/li\u003e\n\u003cli\u003eTitanium EC electrodes\u003c\/li\u003e\n\u003cli\u003eTemperature sensor\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp dir=\"auto\"\u003eA genuine \u003cstrong\u003eBluelab OnePen Replacement Probe\u003c\/strong\u003e is available separately.\u003c\/p\u003e\n\u003ch2 dir=\"auto\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong\u003eDouble-Junction pH Probe\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp dir=\"auto\"\u003eThe OnePen uses a \u003cstrong\u003edouble-junction pH probe\u003c\/strong\u003e designed for durability in nutrient-testing environments.\u003c\/p\u003e\n\u003cp dir=\"auto\"\u003eRegular cleaning, hydration and calibration are still important. Like any quality pH meter, correct maintenance has a significant effect on measurement reliability and probe life.\u003c\/p\u003e\n\u003ch2 dir=\"auto\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong\u003eTitanium EC Electrodes\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp dir=\"auto\"\u003eConductivity measurements are taken through durable \u003cstrong\u003etitanium EC electrodes\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp dir=\"auto\"\u003eThese are integrated into the replaceable sensor assembly alongside the pH and temperature sensors, allowing one probe to perform all three measurements.\u003c\/p\u003e\n\u003ch2 dir=\"auto\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong\u003eProbe Health Indicator\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp dir=\"auto\"\u003eThe OnePen includes a \u003cstrong\u003eprobe health indicator\u003c\/strong\u003e to help monitor sensor condition.\u003c\/p\u003e\n\u003cp dir=\"auto\"\u003eThis provides additional information about the measurement system and can help identify when maintenance or eventual probe replacement may be required.\u003c\/p\u003e\n\u003ch2 dir=\"auto\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong\u003eIP68 Waterproof Design\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp dir=\"auto\"\u003eNutrient meters are routinely used around tanks, irrigation equipment and wet grow-room environments.\u003c\/p\u003e\n\u003cp dir=\"auto\"\u003eThe Bluelab OnePen carries an \u003cstrong\u003eIP68 water and dust resistance rating\u003c\/strong\u003e, making it well suited to horticultural use.\u003c\/p\u003e\n\u003cp dir=\"auto\"\u003eThe waterproof construction provides additional peace of mind when checking reservoirs and nutrient solutions where splashes are unavoidable.\u003c\/p\u003e\n\u003ch2 dir=\"auto\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong\u003eBluetooth Connectivity\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp dir=\"auto\"\u003eThe OnePen incorporates Bluetooth connectivity for integration with \u003cstrong\u003eEdenic by Bluelab\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp dir=\"auto\"\u003eWhen paired with a compatible mobile device, Edenic can be used for functions including:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eViewing live measurements\u003c\/li\u003e\n\u003cli\u003eSaving measurements\u003c\/li\u003e\n\u003cli\u003eSynchronising stored measurements\u003c\/li\u003e\n\u003cli\u003eReviewing historical information\u003c\/li\u003e\n\u003cli\u003eManaging measurement units\u003c\/li\u003e\n\u003cli\u003eAdjusting compatible OnePen settings\u003c\/li\u003e\n\u003cli\u003eSynchronising calibration information\u003c\/li\u003e\n\u003cli\u003eInstalling compatible firmware updates\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp dir=\"auto\"\u003eThis gives growers the option of maintaining digital records rather than relying entirely on handwritten nutrient logs.\u003c\/p\u003e\n\u003ch2 dir=\"auto\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong\u003eIdeal for Hydroponics \u0026amp; Fertigation\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp dir=\"auto\"\u003eThe Bluelab OnePen is designed for testing liquid nutrient solutions and is particularly useful for:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eHydroponic systems\u003c\/li\u003e\n\u003cli\u003eCoco\u003c\/li\u003e\n\u003cli\u003eRun-to-waste irrigation\u003c\/li\u003e\n\u003cli\u003eRecirculating systems\u003c\/li\u003e\n\u003cli\u003eNutrient reservoirs\u003c\/li\u003e\n\u003cli\u003eFertigation tanks\u003c\/li\u003e\n\u003cli\u003eSource water\u003c\/li\u003e\n\u003cli\u003eMixed nutrient solutions\u003c\/li\u003e\n\u003cli\u003eIrrigation solution\u003c\/li\u003e\n\u003cli\u003eRunoff\u003c\/li\u003e\n\u003cli\u003eDrain solution\u003c\/li\u003e\n\u003cli\u003eGreenhouses\u003c\/li\u003e\n\u003cli\u003eIndoor gardens\u003c\/li\u003e\n\u003cli\u003eCommercial horticulture\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp dir=\"auto\"\u003eOne meter can therefore be used throughout the nutrient-management process.\u003c\/p\u003e\n\u003ch2 dir=\"auto\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong\u003eSimple Nutrient Mixing Workflow\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003ch3 dir=\"auto\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong\u003e1. Fill Your Reservoir\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp dir=\"auto\"\u003eBegin with your source water and prepare the required volume.\u003c\/p\u003e\n\u003ch3 dir=\"auto\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong\u003e2. Add Nutrients\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp dir=\"auto\"\u003eAdd your fertilisers and additives according to your feeding program.\u003c\/p\u003e\n\u003cp dir=\"auto\"\u003eMix thoroughly.\u003c\/p\u003e\n\u003ch3 dir=\"auto\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong\u003e3. Check EC\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp dir=\"auto\"\u003eUse the OnePen to determine the conductivity of the finished nutrient solution.\u003c\/p\u003e\n\u003cp dir=\"auto\"\u003eAdjust nutrient strength where required.\u003c\/p\u003e\n\u003ch3 dir=\"auto\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong\u003e4. Check pH\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp dir=\"auto\"\u003eRead pH using the same meter and make any required adjustment.\u003c\/p\u003e\n\u003ch3 dir=\"auto\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong\u003e5. Check Temperature\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp dir=\"auto\"\u003eReview nutrient-solution temperature at the same time.\u003c\/p\u003e\n\u003ch3 dir=\"auto\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong\u003e6. Record Your Results\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp dir=\"auto\"\u003eWhere desired, use Edenic connectivity to help maintain digital measurement records.\u003c\/p\u003e\n\u003ch2 dir=\"auto\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong\u003eTwo-Point pH Calibration\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp dir=\"auto\"\u003eRegular calibration is essential for accurate pH measurement.\u003c\/p\u003e\n\u003cp dir=\"auto\"\u003eThe OnePen supports \u003cstrong\u003etwo-point pH calibration\u003c\/strong\u003e, typically using:\u003c\/p\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003epH 7.0 → pH 4.0\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp dir=\"auto\"\u003eFresh calibration solutions should be used to avoid introducing calibration errors from old or contaminated solution.\u003c\/p\u003e\n\u003cp dir=\"auto\"\u003eBluelab recommends regular probe maintenance and pH calibration to maintain reliable measurements.\u003c\/p\u003e\n\u003ch2 dir=\"auto\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong\u003eEC Calibration\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp dir=\"auto\"\u003eThe OnePen arrives factory calibrated for conductivity.\u003c\/p\u003e\n\u003cp dir=\"auto\"\u003eThe EC sensor can also be recalibrated when required using an appropriate \u003cstrong\u003e2.77 EC calibration solution\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp dir=\"auto\"\u003eKeeping the titanium electrodes clean is important for reliable conductivity measurements.\u003c\/p\u003e\n\u003ch2 dir=\"auto\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong\u003eProbe Care \u0026amp; Maintenance\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp dir=\"auto\"\u003eProper maintenance is particularly important because the OnePen combines multiple sensors into a single probe.\u003c\/p\u003e\n\u003cp dir=\"auto\"\u003eBluelab recommends:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eRinsing the probe in fresh tap water after use\u003c\/li\u003e\n\u003cli\u003eKeeping the pH sensor hydrated\u003c\/li\u003e\n\u003cli\u003eKeeping KCl storage solution in the storage-cap sponge\u003c\/li\u003e\n\u003cli\u003eCleaning the pH bulb regularly\u003c\/li\u003e\n\u003cli\u003eCleaning the EC electrodes regularly\u003c\/li\u003e\n\u003cli\u003eCalibrating pH regularly\u003c\/li\u003e\n\u003cli\u003eUsing fresh calibration solutions\u003c\/li\u003e\n\u003cli\u003eInspecting the glass pH bulb for damage\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp dir=\"auto\"\u003eBluelab recommends cleaning the electrodes and pH bulb and performing pH maintenance approximately \u003cstrong\u003eevery 30 days\u003c\/strong\u003e.\u003c\/p\u003e\n\u003ch2 dir=\"auto\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong\u003eImportant pH Probe Storage\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp dir=\"auto\"\u003eThe pH sensor should \u003cstrong\u003enever be allowed to dry out\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp dir=\"auto\"\u003eKeep the sponge inside the storage cap moist with \u003cstrong\u003eBluelab KCl Storage Solution\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp dir=\"auto\"\u003eDo not use:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eDistilled water\u003c\/li\u003e\n\u003cli\u003eDeionised water\u003c\/li\u003e\n\u003cli\u003eReverse-osmosis water\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp dir=\"auto\"\u003eas a substitute for proper pH probe storage solution.\u003c\/p\u003e\n\u003cp dir=\"auto\"\u003eAlso note that the \u003cstrong\u003etitanium EC electrodes should not be soaked in KCl storage solution\u003c\/strong\u003e. The storage system is designed to keep the pH sensor appropriately hydrated.\u003c\/p\u003e\n\u003ch2 dir=\"auto\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong\u003eWhat's Included\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp dir=\"auto\"\u003eThe Bluelab OnePen package includes:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003e1 × Bluelab OnePen\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e1 × Replaceable pH, EC \u0026amp; Temperature Probe\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e1 × Sensor Cleaning Brush\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e1 × 18mL pH 7.0 Calibration Solution Sachet\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e1 × 18mL pH 4.0 Calibration Solution Sachet\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e1 × Bluelab KCl Storage Solution Sachet\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp dir=\"auto\"\u003eThis gives you the essential solutions required for initial pH preparation and calibration.\u003c\/p\u003e\n\u003ch2 dir=\"auto\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong\u003eTechnical Specifications\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cdiv dir=\"auto\" class=\"group TyagGW_tableContainer\"\u003e\n\u003cdiv class=\"TyagGW_tableWrapper flex flex-col-reverse w-fit\" tabindex=\"-1\"\u003e\n\u003ctable dir=\"auto\" class=\"w-fit min-w-(--thread-content-width)\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth class=\"last:pe-10\"\u003eSpecification\u003c\/th\u003e\n\u003cth class=\"last:pe-10\"\u003eDetails\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eProduct\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBluelab OnePen\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eProduct Code\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePENONE\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMeasurements\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003epH, EC \u0026amp; Temperature\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003epH Range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e0.0–14.0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003epH Resolution\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e0.01\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003epH Accuracy @ 25°C\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e±0.05\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eEC Range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e0–10.00 EC \/ mS\/cm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eEC Resolution\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e0.01\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eEC Accuracy @ 25°C\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e±0.1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCF Range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e0–100\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eppm 500 Range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e0–5000\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eppm 700 Range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e0–7000\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eTemperature Range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e0–50°C \/ 32–122°F\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eTemperature Resolution\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e0.1°C \/ 0.1°F\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eTemperature Accuracy @ 25°C\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e±1°C \/ ±1°F\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eTemperature Compensation\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eAutomatic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003epH Probe\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDouble Junction\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eEC Electrodes\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eTitanium\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eProbe Replaceable\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eYes\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eProbe Health Indicator\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWater\/Dust Rating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eIP68\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eConnectivity\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBluetooth\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCompatible Software\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eEdenic by Bluelab\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePower\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e2 × AAA Alkaline Batteries\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOperating Temperature\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e0–50°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOnePen Warranty\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e2-Year Limited Warranty\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eReplacement Probe Warranty\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e6 Months\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch2 dir=\"auto\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong\u003eBluelab OnePen vs Separate pH \u0026amp; EC Meters\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp dir=\"auto\"\u003eThe main advantage of the OnePen is convenience without sacrificing the core measurements growers need.\u003c\/p\u003e\n\u003cp dir=\"auto\"\u003eInstead of carrying:\u003c\/p\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003epH Meter + EC Meter + Temperature Meter\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp dir=\"auto\"\u003eyou have:\u003c\/p\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eBluelab OnePen = pH + EC + Temperature\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp dir=\"auto\"\u003eIt also provides simultaneous pH and EC display, Bluetooth connectivity and a replaceable combined probe.\u003c\/p\u003e\n\u003cp dir=\"auto\"\u003eFor growers who check nutrient solutions frequently, reducing three measurements to one handheld instrument makes routine testing considerably simpler.\u003c\/p\u003e\n\u003ch2 dir=\"auto\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong\u003eWhy Buy the Bluelab OnePen?\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp dir=\"auto\"\u003eThe \u003cstrong\u003eBluelab OnePen\u003c\/strong\u003e is designed for growers who want accurate nutrient management without maintaining multiple handheld meters.\u003c\/p\u003e\n\u003cp dir=\"auto\"\u003eIts combination of \u003cstrong\u003epH, EC and temperature measurement\u003c\/strong\u003e covers the fundamental parameters required when preparing and monitoring hydroponic nutrient solutions.\u003c\/p\u003e\n\u003cp dir=\"auto\"\u003eThe \u003cstrong\u003e0.01 pH and 0.01 EC resolution\u003c\/strong\u003e provides detailed measurements, while automatic temperature compensation helps account for changing solution temperatures.\u003c\/p\u003e\n\u003cp dir=\"auto\"\u003eMore importantly for long-term ownership, the OnePen isn't built around a permanently fixed pH sensor. Its \u003cstrong\u003ereplaceable probe assembly\u003c\/strong\u003e means the sensing components can be replaced while retaining the main meter.\u003c\/p\u003e\n\u003cp dir=\"auto\"\u003eAdd \u003cstrong\u003eIP68 protection, titanium EC electrodes, a double-junction pH sensor, probe-health monitoring and Edenic Bluetooth connectivity\u003c\/strong\u003e, and the OnePen provides a modern all-in-one solution for growers who want to take nutrient measurement seriously.\u003c\/p\u003e\n\u003ch2 dir=\"auto\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003ch3 dir=\"auto\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong\u003eWhat does the Bluelab OnePen measure?\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp dir=\"auto\"\u003eIt measures \u003cstrong\u003epH, electrical conductivity (EC) and temperature\u003c\/strong\u003e.\u003c\/p\u003e\n\u003ch3 dir=\"auto\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong\u003eCan it measure pH and EC simultaneously?\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp dir=\"auto\"\u003eYes. Simultaneous pH and EC display is one of the OnePen's key features.\u003c\/p\u003e\n\u003ch3 dir=\"auto\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong\u003eWhat is the pH resolution?\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp dir=\"auto\"\u003eThe OnePen provides \u003cstrong\u003e0.01 pH resolution\u003c\/strong\u003e.\u003c\/p\u003e\n\u003ch3 dir=\"auto\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong\u003eWhat is the maximum EC reading?\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp dir=\"auto\"\u003eThe conductivity range extends to \u003cstrong\u003e10.00 EC \/ mS\/cm\u003c\/strong\u003e.\u003c\/p\u003e\n\u003ch3 dir=\"auto\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong\u003eDoes it display PPM?\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp dir=\"auto\"\u003eYes. It supports \u003cstrong\u003eppm 500 and ppm 700\u003c\/strong\u003e, along with EC, mS\/cm and CF.\u003c\/p\u003e\n\u003ch3 dir=\"auto\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong\u003eDoes it compensate for temperature?\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp dir=\"auto\"\u003eYes. The OnePen features \u003cstrong\u003eAutomatic Temperature Compensation\u003c\/strong\u003e.\u003c\/p\u003e\n\u003ch3 dir=\"auto\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong\u003eIs the probe replaceable?\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp dir=\"auto\"\u003eYes. The complete pH, EC and temperature probe assembly can be replaced separately.\u003c\/p\u003e\n\u003ch3 dir=\"auto\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong\u003eIs the OnePen waterproof?\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp dir=\"auto\"\u003eYes. It carries an \u003cstrong\u003eIP68 water and dust resistance rating\u003c\/strong\u003e.\u003c\/p\u003e\n\u003ch3 dir=\"auto\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong\u003eDoes it have Bluetooth?\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp dir=\"auto\"\u003eYes. Bluetooth allows the OnePen to connect with \u003cstrong\u003eEdenic by Bluelab\u003c\/strong\u003e.\u003c\/p\u003e\n\u003ch3 dir=\"auto\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong\u003eDoes it need pH calibration?\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp dir=\"auto\"\u003eYes. Regular pH calibration is required for reliable measurements.\u003c\/p\u003e\n\u003ch3 dir=\"auto\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong\u003eDoes the EC sensor require calibration?\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp dir=\"auto\"\u003eThe conductivity sensor comes factory calibrated, but it can be recalibrated when necessary.\u003c\/p\u003e\n\u003ch3 dir=\"auto\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong\u003eHow should I store the OnePen?\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp dir=\"auto\"\u003eKeep the pH sensor hydrated using \u003cstrong\u003eKCl Storage Solution\u003c\/strong\u003e in the storage-cap sponge. Never allow the pH probe to dry out.\u003c\/p\u003e\n\u003ch3 dir=\"auto\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong\u003eCan I store it in RO or distilled water?\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp dir=\"auto\"\u003eNo. RO, distilled and deionised water should not be used for pH probe storage.\u003c\/p\u003e\n\u003ch3 dir=\"auto\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong\u003eCan I test nutrient runoff with it?\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp dir=\"auto\"\u003eYes. The OnePen is suitable for checking nutrient solutions, source water and runoff.\u003c\/p\u003e\n\u003ch3 dir=\"auto\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong\u003eWhat batteries does it use?\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp dir=\"auto\"\u003eIt uses \u003cstrong\u003e2 × AAA alkaline batteries\u003c\/strong\u003e.\u003c\/p\u003e\n\u003ch3 dir=\"auto\"\u003e\u003cspan role=\"text\"\u003e\u003cstrong\u003eWhat is the warranty?\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp dir=\"auto\"\u003eThe OnePen carries a \u003cstrong\u003e2-year limited warranty\u003c\/strong\u003e, while the replacement probe has a \u003cstrong\u003e6-month warranty\u003c\/strong\u003e.\u003c\/p\u003e","brand":"Bluelab","offers":[{"title":"Bluelab OnePen","offer_id":52611659268386,"sku":"PBLPBL6530S","price":429.99,"currency_code":"AUD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0728\/6833\/1810\/files\/e909b15d-Bluelab-OnePen-01.jpg?v=1790138644","url":"https:\/\/www.greengenius.com.au\/products\/bluelab-ph-ec-combo-pen","provider":"Green Genius","version":"1.0","type":"link"}