HM Digital DM-1 In-Line Dual TDS Monitor

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Product Features

Measures TDS

Tests TDS (total dissolved solids) up to 9990 ppm

Dual Monitoring

Measures both the untreated water and purified water, which can be viewed with the flip of a switch


Automatically shuts the meter after 10 minutes of non-use to conserve battery power

LCD Display

Large and easy-to-read shows TDS

Factory Calibrated

Pre-calibrated, so you can use it right out of the box

Simple Recalibration

Meter can be recalibrated using a mini screwdriver

1/4-inch Connections

Meter easily installs, utilizing 1/4-inch quick connect fittings

Product Description

The HM Digital DM-1 in-line dual TDS monitor allows you to monitor both the untreated water and the purified water and compare the two. The TDS, displayed on the LCD screen, is measured up to 9990 ppm, and the meter comes pre-calibrated and ready to use. The auto-off function conserves battery life, shutting off after 10 minutes of non-use. The systems installs using 1/4-inch quick connect fittings, making installation quick and easy. The DM-1 in-line dual TDS monitor is great for use with RO/DI aquarium filters AND reverse osmosis drinking water systems to monitoring your membrane effeciency and help determine when it's time to change the membrane.

More Info


Range: 0-9990 ppm
Accuracy: ± 2%
Conversion Factor: NaCl (avg. 0.5)
Cable Length: 24.5" (including sensor)
Fitting: 1/4" quick connect
Power source: 2 x 1.5V button cell batteries (LR44 or equivalent; included)
Battery life: approx. 1000 hours of continuous use
Size: 7.6 x 2 x 4.7 cm (3 x .8 x 1.9 in.)
Weight: 79.4 g (2.8 oz.)

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