The Aqua Master Tools E50 Pro2 is a waterproof EC meter pen that shows how strong your nutrient solution is, along with its temperature. It's the updated version of the E50 Pro, now with AAA batteries, a clearer display and a calibration reminder.
EC (electrical conductivity) measures how much dissolved fertiliser is in your water. The more nutrient salts in solution, the higher the reading. Feed charts give a target EC for each stage of growth, and this meter tells you whether the mix in your tank matches it.
Getting the strength right matters in both directions. Too weak and plants run short of nutrients. Too strong and roots struggle to take up water, which often shows first as burnt leaf tips. Measuring each mix takes the guesswork out of feeding.
It's also worth measuring your tap water before you add anything. UK tap water varies a lot from area to area, and its starting EC is part of the total your plants see.
Checking the reservoir over a few days tells you how your plants are feeding. If EC rises, they're taking up more water than nutrients. If it falls, they're using nutrients faster than water. Either way, you'll know whether to top up with plain water or a weaker or stronger mix.
The E50 Pro2 reads 0.00 to 19.99 mS/cm to ±2%, and its automatic temperature compensation keeps readings consistent from 0 to 50°C. Temperature matters here, because the same solution reads higher when it's warm.
It measures EC and temperature only. If you want pH as well, the P110 Pro2 Combo Pen does both in one meter. If your feed chart is written in PPM rather than EC, the H600 Pro handheld meter reads both.
EC electrodes are tougher than pH electrodes and don't need wet storage. They do pick up a film of nutrient salts and limescale over time, which pulls readings low.
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.
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