HM Digital DM-1 Dual TDS Meter

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DM-1-NF does not include quick connect fittings
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Measure tap water coming in vs. purified water going out of your systems at any time!

Part Number: DM-1

Fitting Options

No Fittings
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1/4" Feed x 1/4" Product
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1/4" Feed x 3/8" Product
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3/8" Feed x 3/8" Product
In Stock, Ready to Ship!

HM Digital DM-1 Dual TDS Meter

This water quality tester accurately measures the TDS level in your tap (feed) water and purified (product) water. It enables you to determine just how good or bad your water really is! Use the meter to determine when the reverse osmosis membrane needs replacing.

  • Available with 1/4" and/or 3/8" quick connect fittings. The DM-1-NF does not come with fittings.
  • Highly efficient and accurate due to its advanced microprocessor technology
  • Displays TDS levels of the feed water and product water with in and out electrode probes
  • Auto-off function -- Automatically shuts off meter after 10 minutes of non-use to conserve battery power
  • Dual range 0-9990 ppm (from 0 - 999 ppm the resolution is 1 ppm. From 1000 to 9990 ppm, the resolution is 10 ppm, indicated by a blinking 'x10' image)
  • Factory calibrated -- HM Digital meters are calibrated with a 342 ppm NaCl solution. Meters can be recalibrated with a mini-screwdriver.
  • Installs quickly and easily

Available Options

Part # Feed Line FittingProduct Line Fitting
DM-1-2525 1/4" Quick Connect 1/4" Quick Connect Tee
DM-1-2538 1/4" Quick Connect3/8" Quick Connect Tee
DM-1-38383/8" Quick Connect 3/8" Quick Connect Tee

HM Digital DM-1 Calibration and Maintenance
HM Digital DM-1 Three Year Warranty

3x.8x1.9 "
2.8 oz
24.5 "
1 Year
+/- 2 %
2 x 1.5V button cell batteries (included)
Water-Resistant Casing
Operating Conditions
0-9990 ppm
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