Dual Input Digital In-Line TDS Total Dissolved Solids Water Quality Test Meter

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  • Regular price $24.00
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Total dissolved solids (TDS) are the total weight of all solids (minerals, salts, and metals) that are dissolved in a given volume of water, expressed in parts per million (PPM). The higher the TDS level, the greater the probability of harmful contaminants.

Get accurate readings and learn more about your water quality and hardness with this dual input digital TDS Total Dissolved Solids Meter. The TDS measures water hardness in parts per million, ppm, by measuring electrical conductivity (ec). Displays total dissolved solids from 0-1999 PPM.

The dual input lets you compare the TDS of two samples, ideal for installing on the input and output of a water filter to compare the total dissolved solids coming into and out of the filter. 

This TDS meter includes a mounting bracket for installation on a wall or bulkhead. It can be calibrated using a standard calibration solution by turning the trimpot on the side of the case with a small screwdriver (included). 

This TDS Total Dissolved Solids meter can be used to:

  • Check the performance of your water filter or water purifier

  • Test for water hardness (1 grain = 17ppm)

  • Monitor the quality of your drinking water

  • Monitor pools, spas, aquariums and hydroponics 


  1. Immerse the sensors in the water to be tested, or connect the sensors into your system's input and output water lines using the included connectors.
  2. Slide the switch to the IN position. The display reads the TDS measured for the input probe. 
  3. Slide the switch to the OUT position. The display reads the TDS measured for the output probe. 
  4. After use, turn the switch to the OFF position to shut off the meter.


  • Dual Inputs: Measures two probes from 0-1999 ppm with a resolution of 1 ppm

  • Accuracy +/- 2% of full scale

  • Battery: 4x LR44 1.5V Button Cells (Included)

  • Meter size: 60mm x 54mm x 22mm (2.4" x 2.1" x 0.9")

Package Includes:

1X Dual TDS Water Quality Test Meter with two probes
4X LR44 batteries
Mounting Bracket
Self-adhesive Velcro mounting pads
Calibration screwdriver
Operating instructions