TDS Testing Meter



  • Graphite electrodes
  • ATC
  • Simple one point calibration
  • Easy to use
  • Economical

DiST® testers are reliable, pocket-sized instruments that will give you quick and accurate readings of conductivity and TDS.

This popular line of Dissolved Solids Testers have been redesigned to offer a host of improvements.  They are widely used for monitoring EC/TDS in drinking water, water conditioning, reverse osmosis, cooling towers, wastewater, laboratories, agriculture, aquaculture,and aquariums, hydroponics, and the printing industry.

The casing has been modified to provide increased strength, a better fit for holding and a large LCD for easy viewing. The graphite sensors provide better repeatability since they do not oxidize. The casing has been engineered to allow air bubbles to escape. The temperature sensor is exposed to provide faster response time.

This tester features an amperometric graphite electrode that provides better repeatability in measurements since they do not oxidize. An amperometric measurement of TDS is based on Ohm’s Law, I = V/R where R depends on the distance between two pins and their surface. Oxidation changes both the distance and surface which will affect accuracy. The DiST’s non-oxidizing graphite pins are able to provide an optimal surface for accurate, dependable results.

If calibration is necessary, simply submerge the electrode tip into calibration solution and adjust the trimmer on the side of the tester.



10.00 ppt (g/L)
0.01 ppt (g/L)
±2% F.S.
TDS Factor
Calibration Solution
HI 70038
manual, 1 point
HI 73302
Temperature Compensation
automatic, 0 to 50°C (32 to 122°F)
Battery Type / Life
4 x 1.5V / approx. 200 hours of continuous use
0 to 50°C (32 to 122°F); RH max 95%
175 x 41 x 23 mm (6.9 x 1.6 x 0.9″)
95 g (3.4 oz.)