Rs. 1,999

SM-1: In-line Single TDS Monitor

HM Digital "SM-1" is a Single In-Line TDS Monitor that provides an easy-to-read TDS reading on the monitor. It is ideal for any water filtration system including reverse osmosis systems, coolers, and much more.

Easy to use and install. It includes an Auto-Off function which saves your battery life.


  • Displays the 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.
  • Comes equipped with one 1/4 inch T-fitting (also available in 3/8″ or 1/2″).
  • Also available without T-fitting (Model: SM-1WOF)
  • Installs quickly and easily


  • Range: 0-9990 ppm: (0 – 999 ppm the resolution is 1 ppm. From 1000 to 9990 ppm, the resolution is 10 ppm, indicated by a blinking ‘x10’ image.)
  • Accuracy: ±2%
  • Conversion Factor: NaCl (avg. 0.5)
  • Cable Length: 24.5″ (including sensor)
  • Fittings: 1/4″ standard, also available with 3/8″ or 1/2″
  • 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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