Bluelab pH Pen – Waterproof 0-14 pH Meter
Bluelab pH Pen – Waterproof 0-14 pH Meter
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Description
Lab-grade pH accuracy in a waterproof pen that floats
The Bluelab pH Pen brings the accuracy growers rely on across the Bluelab range down into a compact handheld meter. It reads pH across the full 0.0 to 14.0 range to +/-0.1, uses automatic temperature compensation so readings stay honest as your reservoir warms and cools, and is fully waterproof and floats - so an accidental drop in the tank is no drama. A backlit display keeps it readable under dim grow-room lighting.
Fixing nutrient lockout caused by pH drift
Even a perfectly mixed feed becomes unavailable to the roots once pH drifts outside the target band, showing up as yellowing, poor uptake and slow growth that looks like a nutrient shortage but isn't. Accurate, regular pH checks catch that drift early - in hydro reservoirs and in soil or coco run-off - before it costs you a harvest.
How to Use
- Before first use, calibrate with the supplied pH 7.0 and pH 4.0 sachets
- Recalibrate every 30 days or when the on-screen reminder prompts you
- Dip the probe fully into the solution, swirl gently and wait for the reading to stabilise
- Rinse after use and store the probe tip damp in storage solution, never dry
- Replace the single AAA battery when the display dims
Technical Specifications
- pH range: 0.0 to 14.0
- pH accuracy: +/-0.1 at 25C
- Resolution: 0.1 pH
- Temperature range: 0 to 50C (32 to 122F)
- Temperature compensation: automatic
- Calibration: Manual, 2 or 3 point (pH 7.0, 4.0, 10.0), with 30-day reminder
- Display: backlit LCD, selectable C or F
- Water resistance: fully waterproof, floats in solution
- Power: 1x AAA alkaline battery
- Warranty: 1 year
- Measures: pH and temperature
- Temperature accuracy: ±1°C at 25°C
- Temperature resolution: 1°C
- Auto power-off: After 4 minutes
- Battery life: 350 hours
- Minimum solution strength: 0.2 EC and above
- Units: pH, °C and °F
Questions & answers
How often should I calibrate it?
Calibrate before first use with the supplied pH 7.0 and pH 4.0 sachets, then every 30 days or when the on-screen reminder prompts you.
Is it waterproof?
Yes, it's fully waterproof and floats if you drop it in the tank.
How should I store the probe?
Rinse it after use and keep the probe tip damp in storage solution, never dry.
Can I test plain RO water with it?
It's designed for solutions of 0.2 EC and above, so it isn't intended for very pure water such as straight RO.
What battery does it take?
One AAA alkaline battery, which lasts around 350 hours. The pen switches itself off after 4 minutes.
