HM Digital TDS-4 Pocket Size TDS Tester Meter with 0-9990 ppm Measurement Range , 1 ppm Resolution, +/- 2% Readout Accuracy auspowers_batchsix The colors may exist slight

The colors may exist slight differences due to different screen displays

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HM Digital TDS-4 Pocket Size TDS Tester Meter with 0-9990 ppm Measurement Range , 1 ppm Resolution, +/- 2% Readout Accuracy auspowers_batchsix The colors may exist slightHM Digital TDS 4 Pocket Size TDS Tester Meter with 0 9990 ppm Measurement Range , 1 ppm Resolution, + 2% Readout Accuracy How Pure is Your Water? 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 4 can tell you your overall water purity level,