Bluelab OnePen | pH EC Temperature Meter

Bluelab OnePen | pH EC Temperature Meter

If you’re serious about dialling in your nutrient solution, the Bluelab OnePen makes it easy to get the numbers right every time. This smart 3-in-1 handheld meter measures pH, conductivity (EC) and temperature in one go, so you can keep your hydroponic or fertigation setup humming without juggling multiple tools.

Why You'll Love It

• All-in-one pen that measures pH, conductivity (EC) and temperature in your nutrient solution.
• Simultaneous pH and EC display on a bright, backlit screen for quick at-a-glance checks.
• Connects via Bluetooth to the Edenic app so you can log, store and review measurements from your phone or browser.
• Replaceable double-junction pH probe and titanium EC electrodes extend the life of the pen and reduce waste.
• IP68 dustproof and waterproof rating, built to cope with splashes, spills and life around tanks and reservoirs.
• Precision readings with 0.01 pH resolution and accurate EC and temperature monitoring for tight control.
• Simple 2-point pH calibration with on-screen prompts and probe health indicators to keep you on track.
• Automatic temperature compensation for reliable results across changing conditions.
• Compact, ergonomic design that’s comfortable to hold and easy to use in tight spaces like tanks and pots.

Key Details

• Measures: pH, conductivity (EC/CF/ppm 500/ppm 700/mS cm^-1) and temperature (°C/°F).
• Measurement ranges: 0.0–14.0 pH; 0–10.0 EC; 0–100 CF; 0–5000 ppm (TDS 500); 0–7000 ppm (700 scale); 0–10.0 mS/cm; 0–50 °C (32–122 °F).
• Resolution: 0.01 pH; 0.01 EC; 0.1 CF; 10 ppm (500/700); 0.01 mS/cm; 0.1 °C/°F.
• Accuracy at 25 °C: ±0.05 pH; ±0.1 EC; ±1 CF; ±50 ppm (500); ±70 ppm (700); ±0.1 mS/cm; ±1 °C/°F.
• pH calibration: two-point (pH 7.0 plus pH 4.0 or pH 10.0) using standard buffer solutions.
• Factory-calibrated EC; optional EC calibration with 2.77 EC solution if required.
• Power: 2 x AAA alkaline batteries, with auto-off and low-battery indicator.
• Operating environment: 0–50 °C; IP68 rated for dust and water ingress.
• Warranty: 2-year limited warranty on the meter; 6-month warranty on the replacement probe (per Bluelab).
• Compatible with the Bluelab Edenic app (Android 8.0+/iOS 12+), using Bluetooth 5 Low Energy.

How to Use

• Before first use, hydrate the pH glass bulb in Bluelab KCl storage solution for 24 hours.
• Calibrate pH at two points (pH 7.0 then pH 4.0 or pH 10.0) using fresh, uncontaminated buffer solutions.
• Select your preferred units for EC and temperature, and choose the display mode (pH/Temp, EC/Temp or EC/pH).
• Rinse the probe in fresh water, then place it into your nutrient solution, runoff or water source until the readings stabilise.
• Press the measure button to hold and save the reading; data can be synced to Edenic if connected via Bluetooth.
• Clean the probe regularly with Bluelab probe cleaner and store with KCl solution in the cap to maximise probe life.

Whether you’re running a small home grow or managing a commercial setup, the Bluelab OnePen gives you accurate, reliable pH, EC and temperature readings in one tough little unit. Pair it with the Edenic app and you’ll have your nutrient data at your fingertips, helping you grow healthier plants with fewer headaches.