Water Sanitizers

HM Digital ZT-2 Pocket TDS Tester Auto-off function. Large easy to read LCD. Factory Calibrated with a 342 ppm NaCl solution. Range: 0 – 999 ppm (mg/L). Resolution: 1 ppm (0-999 ppm). Accuracy: +/- 3%. EC-to-TDS Conversion Factor: NaCl...