HM DM-3 Inline TDS Meter and EC Water Tester with Dual Probes

See how effectively your filtration system cleans water without repeatedly collecting samples. The HM DM-3 is a commercial-grade dual probe water monitor that compares feed and filtered water through separate in-and-out sensors. Its large backlit LCD makes readings easy to check, even in dim installations. Designed for RO and DI systems, this reverse osmosis water tester delivers convenient, ongoing TDS and EC monitoring.

Key Features

• Dual probes compare input and output water quality.
• Measures TDS from 0–5000 ppm and EC from 0–9999 µS.
• Large backlit LCD provides clear simultaneous readings.
• Factory calibrated with digital recalibration for each line.
• Shielded 1.2 m sensor cables help maintain stable readings.
• Includes 1/4-inch probes for quick-connect fittings.

Why Choose Our HM DM-3 Inline TDS Meter

Handheld meters require separate manual tests and make comparisons less convenient. The DM-3 remains installed directly in the water line, allowing you to check filtration performance whenever needed. Its ±2% accuracy, diagnostic messages, and individual line calibration suit both home and commercial systems.

Perfect For

Ideal for drinking-water filters, reverse osmosis systems, deionization units, aquariums, hydroponics, water-treatment equipment, and commercial purification setups.

Care and Use

Install one probe on the feed line and the other on the filtered-water line. Keep connections leak-free and clean the probes gently with distilled water when buildup appears. This model measures TDS and EC; it does not measure pH.

Monitor Every Drop with Confidence

Make filter checks faster and easier with reliable in-line readings. Order the HM DM-3 today and stay informed about your water system’s performance.