Aqua Master Tools P110 Pro2 Combo Pen: pH, EC & Temperature

P110 Pro2 pH and EC Meter Combo Pen

The Aqua Master Tools P110 Pro2 measures pH, EC and temperature in one waterproof pen. Those are the three readings that tell you whether a nutrient solution is right before it reaches your plants. It's the updated P110 Pro, now with AAA batteries, a clearer display and a calibration reminder.

It's the meter we'd suggest for most first setups. pH and EC answer different questions, and you need both answered every time you mix. EC tells you how strong the feed is. pH tells you whether the plant can actually take that feed up. One pen means one routine, one set of batteries and nothing to forget.

pH controls nutrient uptake. Most hydroponic and coco feeds are designed to run between pH 5.5 and 6.5, soil a little higher. Outside that range, some nutrients become harder for roots to absorb, even when they're in the tank. The P110 Pro2 reads 0.1 to 14.0 pH to ±0.1.

EC measures how much dissolved fertiliser is in the water. Too low and plants go short; too high and roots struggle to take up water. The pen reads 0.0 to 19.99 mS/cm, which covers every feed strength you'll use, with automatic temperature compensation from 0 to 50°C.

Unlike most pH pens, the P110 Pro2 has a dry-storage electrode, so it doesn't need to sit in storage solution between uses. If you've ever had a pH pen die because the cap dried out, that's the problem this solves.

If you only need one of the two readings, the P50 Pro2 (pH) or E50 Pro2 (EC) costs less. If your feed chart is written in PPM, or you'd like a bigger screen and a carry case, the H600 Pro handheld meter is the step up.

• pH, EC and temperature in one pen
• Two-point automatic pH calibration at pH 7.00 and 4.01
• EC calibrates with any EC calibration solution, so you can use whichever standard you already have
• Dry-storage electrode: no storage solution needed between uses
• Calibration reminder: an icon appears 30 days after your last calibration
• Selectable resolution of 0.01 or 0.1 for both pH and EC
• IP67 waterproof and floats: lift it straight back out if it goes in the tank
• High-contrast display: white characters on black, readable in low light
• Runs on 2 x AAA batteries, with a battery indicator and auto power-off after 8 minutes
• Replaceable electrode: one combined pH and EC electrode, replaced in minutes
• One-year warranty on the meter and six months on the electrode

You get

• 1 x P110 Pro2 pH, EC and temperature combo pen with protective cap and cap cord
• 2 x AAA batteries
• User manual

How to use it

1. Before first use, soak the electrode in tap water for at least 12 hours. White salt crystals around the tip are normal and dissolve as it soaks.
2. Calibrate pH with pH 7.00 solution, then pH 4.01. Calibrate EC with your EC solution. Rinse in tap water between each.
3. Mix your feed, adjust EC first, then pH. Adding nutrients changes pH, so correcting pH last saves you doing it twice.
4. Rinse the tip after each reading and recalibrate when the reminder appears.

Tip: calibration solution loses accuracy once it's been used. Pour a little into a clean cup for each calibration and throw it away afterwards, rather than dipping the pen into the bottle.

Order online for delivery in plain, unbranded packaging, or use free Click & Collect from your local GroWell shop. If you're not sure which meter suits your setup, call or message the team and we'll talk it through.