Aqua Master E50 Pro EC Meter + Temperature

What does the Aqua Master E50 Pro measure?

It measures electrical conductivity (EC) and temperature in liquids. It's ideal for hydroponic nutrient tanks, mixing buckets, runoff samples, aquariums, and more. It does not show PPM or TDS values directly.

What’s the EC and temperature range on the E50 Pro?

The EC range is 0.0–19.9 mS/cm (±2% accuracy). Temperature range is 0–50°C (±0.5°C). It includes automatic temperature compensation (ATC) to keep EC readings consistent as water warms or cools.

How do I calibrate the Aqua Master E50 Pro?

It uses 1-point automatic EC calibration with a 1413 µS/cm (1.413 mS/cm) solution. You should calibrate before first use and at least monthly. EC 2.76/2.77 can be used for checking but not for calibration.

How often should I calibrate the E50 Pro?

Monthly is a good routine. Calibrate more often if you're using high-EC feeds, testing daily, or notice inconsistent readings. Always use fresh calibration solution and rinse the probe before and after.

How should I clean and maintain the sensor?

Rinse with clean water before and after use. Avoid scraping the sensor—soak and rinse instead. If readings seem off, clean off salt buildup, recalibrate, and avoid using in undiluted concentrates.

Why does my EC reading jump or drift?

Common causes include air bubbles on the sensor, poor mixing, residue buildup, or temperature swings. Gently swirl the probe and ensure your solution is well-circulated for stable readings.

Where should I take EC measurements?

You can test directly in the reservoir or use a clean sample cup. Measure in a well-mixed zone, away from air stones and dosing outlets. This gives a more accurate picture of nutrient strength.

Why does EC change over time even if I don’t add nutrients?

Evaporation raises EC by concentrating salts. Topping up with plain water lowers EC. Plants also absorb nutrients unevenly, which shifts EC even if your mix hasn’t changed.

Can the Aqua Master E50 Pro help prevent overfeeding or deficiencies?

Yes—it helps you avoid high EC (nutrient burn) and spot low EC (underfeeding) early. It won’t fix problems directly, but it helps you stay in the right nutrient range.

Does the E50 Pro replace a pH meter?

No—it measures EC and temperature only. To manage pH levels, you’ll need a separate pH meter.

Is the Aqua Master E50 Pro waterproof and durable?

Yes—it’s IP67 waterproof and floats if dropped in water. It also features an auto shut-off after 8 minutes and includes a low-battery warning to keep your readings reliable.

What batteries does the E50 Pro use?

It runs on three 1.5V AG-13 button cell batteries. Replace them when the low-battery indicator appears, as low power can affect measurement accuracy.

Can I leave the Aqua Master E50 Pro in the tank full-time?

No—it’s designed as a handheld tester for quick dips, not constant immersion. Long soaks can lead to faster sensor fouling and inaccurate readings.

What’s the best routine to keep the Aqua Master E50 Pro accurate?

Rinse → test in a well-mixed sample → rinse again → clean when needed → calibrate monthly with EC 1413. Skipping rinses or letting salt build up is the #1 cause of bad readings.