SM-1 HM Digital In-Line Single TDS Monitor

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More Information
Brand HM Digital

Note:  This model requires a tee fitting (sold separately) for installation.    Recommended Fitting for 1/4" Tube: F-4UT44QC, or for 3/8" Tube:  F-6UT64QC

HM Digital SM-1 In-Line Single TDS Monitor

Ideal for monitoring the performance of a home RO water treatment system.

The SM-1 is provides an easy to read single line TDS monitor that provides a digital readout. It is ideal for any water filtration system, including reverse osmosis systems, coolers and much more.

Features of HM Digital SM-1 Total Dissolved Solids Meter

  • Displays TDS level of a single water line
  • Efficient and accurate
  • Auto-Off function conserves battery power. (Shuts off automatically after 10 minutes of non-use)
  • Factory Calibrated: our meters are calibrated with a 342 ppm NaCl solution. Meters can be recalibrated with a mini-screwdriver.
  • Installs quickly and easily

Note:  This model requires a tee fitting (sold separately) for installation.   Recommended Fitting for 1/4" Tube F-4UT44QC, or for 3/8" Tube:  F-6UT64QC


SM-1 Specifications

Model: SM-1
Brand:  HM Digital
Measures: Total Dissolved Solids (TDS) 
Measurement Unit: Parts Per Million (PPM)
Range: 0-9990 ppm*

0-999 ppm:  1 ppm
1000 - 9990 ppm:  10 ppm
Accuracy: +/- 2%
Cable Length: 24.5" (including sensor)
Fittings: Not included.  Requires 1/4" QC tee.
Power Source: 2x 1.5v button cell batteries (LR44 or equivalent); included
Battery Life: Approx. 1000 hours of continuous use
Size: 3" x 8" x 1.9"  (7.6 x 2 x 4.7 cm)
Weight: 2.8 oz (79.4 g)
Conversion Factor: NaCl (avg. 0.5)

*The SM-1 has a 3 digit display.  For measurements of 0-999 ppm, the resolution is 1 ppm.  From 1000 to 9990 ppm, the resolution is 10pm, and is indicated by a blinking x10' image.)