TDS20 Value Pocket TDS Tester


Simply the most reliable pocket conductivity tester with the best value for all kinds of routine testing, including tap water/drinking water testing, agriculture, aquaculture, swimming pool, education, etc.

  • The unique platinum black conductivity probe technology ensures wide range measurement with accuracy and consistency.
  • An ultra clear 180˚ viewing angle screen with temp./TDS value dual display and indications of completed auto calibrations and stable readings.
  • Complete kit with calibration solutions (1413 µs and 12.88 mS), AAA batteries, and a lanyard all in a rugged carrying case.
  • 1-2 points auto calibration and 0 to 50˚C auto temp. compensation, ±1% F.S accuracy with 0 to 20.00 mS/cm wide conductivity measuring range
  • Self-diagnosis with out-of -range warning and incorrect calibration warning.
  • IP67 Water-proof and dust-proof, floats on water so no need to worry if you drop it in the water by accident.
  • Up to 1000 hours' continuous operation powered by AAA batteries (with low power warning and auto power off in 8 min if no operation)


TDS-Measuring Range

0 to 100.0 ppm

0 to 1000 ppm

0 to 10.00 ppt


0.1/1 ppm; 0.01 ppt


±1 % F.S


Automatic 1- to 2-Point-Calibration

Temperature compensation

0 to 50 °C (automatic)

Temperature-Measuring Range

0 to 50 °C

Temperature- Resolution

0.1 °C


±0.5 °C

Power Supply

4 × AAA Batteries

Battery Life

Up to 1000 h

IP Rating

IP67 (waterproof and floatable)


40×31×178 mm
(with carrying case 190×165×40 mm)


107 g (with carrying case 438 g)


  • TDS20 Tester
  • Calibration solutions (1413 μS/cm; 12.88 mS/cm, each 50 ml)
  • Lanyard
  • Carrying Case

Deutsch (TDS20_DE_2018.pdf, 896 Kb) [Download]

English Manual (TDS20_EN_2018.pdf, 833 Kb) [Download]