Rainman Hydrotester


Measure nutrients, salts, and other dissolved solids. As your membranes age, the TDS (total dissolved solids) of the product water will gradually increase. A hydrotester will measure the water quality in terms of how much salt is being removed. It is common to want to change membranes when the system gets to about 750-800ppm (parts per million) of TDS.


  • Four modes: EC: mS, uS, TDS: ppt, ppm.
  • Fast and accurate, +/-2%
  • Simple to use
  • Digital calibration
  • Water resistant
  • Durable
  • Auto shut off after five minutes
  • EC to TDS conversion factor: NaCl (0.5 avg)
  • Auto temperature compensation (ATC)
  • Hold function
  • Power: 3 x 1.5V (357A)
  • Battery life: approximately 2 years
  • Length 153mm (6.0″), Width 32mm (1.3″), Height 18mm (0.7″)
  • Weight: 53.9g (1.9oz)

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