HM Digital TDS-4 Pocket Size TDS Tester Meter with 0-9990 ppm Measurement Range , 1 ppm Resolution, +/- 2% Readout Accuracy auspowers_batchsix and green colored lids

and green colored lids

1/4" Compression Tube x 1/4" Female NPTF

Automatic Pepper Mill

Unicorn Hug Buddy Air Vent Car Phone Holder

The colors may exist slight differences due to different screen displays

HM Digital TDS-4 Pocket Size TDS Tester Meter with 0-9990 ppm Measurement Range , 1 ppm Resolution, +/- 2% Readout Accuracy auspowers_batchsix and green colored lidsHM 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,