Aqua Master E50 Pro2 EC Meter - Waterproof EC & Temperature Pen

Know Exactly How Strong Your Feed Is with the Aqua Master E50 Pro2 EC Meter

A nutrient bottle gives you a dose. It doesn't tell you what's actually in the tank. The Aqua Master E50 Pro2 does. It's a waterproof pen that reads EC (electrical conductivity, a measure of how much feed is dissolved in your water) and temperature from 0.00 to 19.99 mS/cm, accurate to ±2%. It floats, runs on two AAA batteries and calibrates with any EC calibration solution.

Why You Need It

Too little feed and plants go hungry. Too much and the roots struggle to take up water. Your tap water already carries minerals before a drop of nutrient goes in, so the only way to know your real starting point is to measure it.

EC also tells you how your plants are drinking. If reservoir EC rises between top-ups, they're taking more water than nutrients. If it falls, they're eating faster than they're drinking.

Is the E50 Pro2 Right for Your Setup?

• First EC meter: one job, one number, a 30-day calibration reminder and not much to get wrong.
• Need pH too? Pair it with the Aqua Master P50 Pro2 pH Meter, or get both readings in one pen with the P110 Pro2 Combo Pen.
• Want PPM? The E50 Pro2 reads EC only. That's no bad thing: EC means the same on every meter, while PPM changes with the scale your meter uses.

How the E50 Pro2 Works

The electrode measures how easily a tiny current passes through your solution. More dissolved nutrient means more conductivity and a higher number. Conductivity also climbs with temperature, so ATC (automatic temperature compensation) corrects the reading from 0 to 50°C. You can show 0.01 or 0.1 mS/cm, but accuracy stays ±2% either way.

Key Benefits

• IP67 waterproof: it floats, so a dip in the reservoir won't end its career.
• Calibrates with any EC solution: digital manual calibration, so you're not tied to one buffer.
• 30-day reminder: the CAL tick disappears when it's time to calibrate again.
• AAA batteries: two standard AAAs, included, with a low battery warning.
• Replaceable electrode: if the sensor wears out, swap it, not the whole meter.
• Auto power-off: shuts down after 8 minutes to save the batteries.

Contains

• 1 x E50 Pro2 meter with protective cap and cap cord
• 2 x 1.5V AAA batteries and user manual

Not included: EC 1.413 calibration solution.

E50 Pro2 Specifications

EC range	0.00 to 19.99 mS/cm
EC accuracy	±2%
EC resolution	0.01 or 0.1 mS/cm
Temperature	0 to 50°C, ±1°C
Calibration	Digital manual, any EC solution
Waterproof rating	IP67, floats
Power	2 x 1.5V AAA, included
Size and weight	230 x 43 x 43mm, 132g
Warranty	1 year meter, 6 months electrode

How To Use the E50 Pro2

1. Calibrate: dip the electrode in EC calibration solution and set the display to the solution's value, following the manual.
2. Test your water: measure plain tap water first so you know your starting EC.
3. Mix to target: add nutrients, stir, dip and read. Add more feed or water until you hit your number.
4. Then do pH: nutrients move pH, so always set EC first.
5. Rinse and cap: rinse the electrode after use and refit the protective cap.

Top tip: Note your reservoir EC every day. The trend tells you more than any single reading, and it's the quickest way to spot plants that want a stronger or weaker feed.

FAQs

Does the E50 Pro2 read PPM?
No, it reads EC in mS/cm. PPM figures depend on whether a meter uses the 500 or 700 scale, so the same solution can show two different PPM numbers. EC is the same everywhere.

What's the difference between the E50 Pro and E50 Pro2?
The Pro2 runs on AAA batteries instead of button cells and adds a white-on-black display, 0.01 mS/cm resolution, the 30-day reminder and calibration with any EC solution.

Which calibration solution should I use?
Any EC calibration solution works. Our Aqua Master EC 1.413 is the easy choice.

Need help choosing? Call our growing experts on 01782 749955 or visit One Stop Grow Shop Stoke at Fenton Trade Park.

Get the strength right and every feed lands where it should. Browse our full range of pH and EC meters.