SM-1: In-line Single TDS Monitor

HM Digital SM-1 has an easy-to-read single line TDS monitor providing a digital readout. The SM-1 is perfect for any water filtration system including reverse osmosis systems, coolers and much more.

Price incl. GST

99 in stock

Categories: , SKU: SM-1


  • Accurate and efficient
  • Quickly and easily installs
  • Made available without T-fitting (Model: SM-1WOF)
  • Displays TDS level of a single water line
  • Comes equipped with one 1/4 inch T-fitting (also available in 3/8″ or 1/2″).
  • With auto-off function that helps conserve battery power (Automatically shuts of when not in use for 10 minutes)
  • Factory Calibrated: meters are calibrated with a 342 ppm NaCl solution and can be re-calibrated with a mini-screwdriver.

Additional information

Weight 0.15 kg


Weight: 79.4 g (2.8 oz.)

Accuracy: ±2%

Fittings: 1/4″ standard, also available with 3/8″ or 1/2″

Size: 7.6 x 2 x 4.7 cm (3 x .8 x 1.9 in.)

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.)

Battery Life: approximately 1000 hours of continuous use

Conversion Factor: NaCl (avg. 0.5)

Power Source: 2 x 1.5V button cell batteries (LR44 or equivalent; included)

Cable Length: 24.5″ (including sensor)


  • Drinking Water
  • Food & Beverage
  • Water Treatment
  • Window Cleaning/Carwash