Description
pH, EC and temperature from one waterproof pen that floats
The Aqua Master Tools P110 Pro 2 Combo Pen measures pH, EC and temperature from a single replaceable electrode, so one dip tells you whether a nutrient solution is ready to feed. It is the upgraded version of Aqua Master's long-running P110: it now runs on standard AAA batteries instead of button cells, has a black display with white characters that is easier to read in a dim grow room, and lets you choose one or two decimal places. It reads pH from 0.1 to 14.00 and EC from 0.0 to 19.99 mS/cm, with automatic temperature compensation from 0 to 50°C, so a cold tap-water mix and a warm reservoir give comparable results. The housing is IP67 waterproof and floats, the electrode is designed for dry storage, and a calibration indicator reminds you to recalibrate 30 days after the last successful calibration.
Key Benefits
- Three readings, one pen – pH, EC and temperature from a single electrode
- Resolution to 0.01 – switch pH and EC between one and two decimal places
- IP67 and floats – a pen dropped in the tank stays on the surface
- Dry-storage, replaceable electrode – no storage solution to keep topped up, and a worn probe is swapped rather than the whole meter
- AAA batteries – standard cells, included, with a battery indicator and auto power-off after 8 minutes
- 30-day calibration reminder – the indicator shows when it is time to recalibrate
Feeding Blind: When pH and EC Are Off
Most feeding problems start in the mixing bucket. An EC that is too strong burns leaf tips and stalls growth; too weak and plants go hungry; and a pH outside the range for your medium locks nutrients out even when they are in the solution, showing up as yellowing, spotting and poor nutrient uptake. Measuring both before every feed, and checking run-off now and then, is the simplest way to keep plants on track in soil, coco or hydro.
How to Use
- Before first use: soak the electrode in tap water for at least 12 hours. Dried salts around the pH electrode are normal and dissolve away.
- Remove the cap, rinse the electrode with distilled water and switch the pen on.
- Stand it upright in the solution up to the edge of the electrode housing, stir gently and wait a few seconds for the reading to settle.
- Press MODE to switch between pH and EC; the TEMP/CAL button changes the temperature unit and is used for calibration.
- Rinse the electrode after use, let it dry, refit the cap and switch off; the pen also powers itself off after 8 minutes.
- Calibrate pH with 4.0 and 7.0 buffers (automatic two-point) and EC manually against an EC calibration solution, with the solution at about 25°C.
Technical Specifications
- Measures: pH, EC and temperature
- Range: pH 0.1–14.00; EC 0.0–19.99 mS/cm; temperature 0–50°C
- Resolution: pH 0.01 or 0.1; EC 0.01 or 0.1 mS/cm; temperature 0.1°C
- Accuracy: pH ±0.1; EC ±2% F.S.; temperature ±0.5°C
- Temperature compensation: automatic, 0–50°C
- Calibration: pH 2-point automatic at 4.0 and 7.0; EC manual, with any EC calibration solution
- Calibration indicator: clears after a successful calibration and returns after 30 days
- Electrode: replaceable, dry storage
- Power: 2 x 1.5V AAA batteries (included); battery indicator; auto power-off after 8 minutes
- Waterproofing: IP67, floats
- Weight: 132 g
- Warranty: 1 year on the meter, 6 months on the electrode
- Dimensions: 23 x 4.3 x 4.3 cm
Frequently Asked Questions
What is different from the original P110 Pro?
The Pro 2 runs on AAA batteries rather than button cells, has a black display with white characters, lets you choose one or two decimal places and reminds you to recalibrate after 30 days. It still reads pH, EC and temperature from one replaceable electrode.
Does the electrode need to be kept in storage solution?
No. It is a dry-storage electrode: rinse it after use, let it dry and refit the cap. Before its first use, soak it in tap water for at least 12 hours to activate it.
Which calibration solutions do I need?
pH 4.0 and pH 7.0 buffers for the automatic two-point pH calibration. EC is calibrated manually, so any EC calibration solution within the meter's range can be used.
Can I read PPM with it?
It displays EC in mS/cm. To convert to PPM, multiply the reading by 500 or 700, depending on which scale your feed chart uses.
Works Well With
pH 4.01 and 7.00 buffers for the two-point calibration
An EC standard for the manual EC calibration
