Sub Menu contents

Testing Meters UK accepted payments

SM-1: In-Line Single TDS Meter

FM-2: Filter Monitor | DM-2: Dual TDS Monitor 2 | DM-1: Dual TDS Monitor
SM-1: In-Line Single TDS Meter

Ideal for any water filtration system including reverse osmosis systems, coolers and much more.


Range: 0-9990 ppm
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 (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.)

  • Displays TDS level of a single water line.
  • Highly efficient and accurate due to its advanced microprocessor technology.
  • Auto-Off function conserves battery power. The unit shuts off automatically after 10 minutes of non-use.
  • Wide 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 :- our meters are calibrated with a 342 ppm NaCl solution. Meters can be recalibrated with a mini-screwdriver.
  • Comes equipped with John Guest Quick-Connect T-fitting (1/4 inch standard).
  • Installs quickly and easily.

  • Price includes delivery to the UK

    Please select a fitting size:

    With 1/4" fitting: £17.02 + vat (£20.42)

    Sorry, currently sold out

    With 1/2" fitting: £20.43 + vat (£24.52)

    Sorry, currently sold out

  • This product will be dispatched by Royal Mail 1st Class service. Bulk orders will be shipped by courier service.

    Order before 4pm for same day dispatch (weekdays only)

    Courier orders will be dispatched same day if ordered before 3pm (weekdays only)