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HM Digital TDS-EZ Water Quality TDS Tester, 0-9990 ppm Measurement Range, 1 ppm Resolution, 3% Readout AccuracyProduct Description: A TDS meter (aka ppm pen, nutrient tester, tds stick) is an inexpensive and convenient digital tool to instantly check your overall water quality. TDS = Total Dissolved Solids, which is any salt, metal or mineral in the water. With the push of a button, the TDS-EZ can tell you y...$15.25$17.77 -
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HM Digital C342 TDS and EC Calibration Solution, 342 ppm (NaCl), 90 ml VolumeTDS Meter NaCl Calibration Solution C-342.$8.59$12.95
