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TDS Tester, 0-999 ppm, HM Digital - TDS-EZ
Our Price: $24.99

Ideal for all basic water testing applications. The best value meter for residential applications.
TDS Comparitor, 0-9990 ppm, HM-Digital DM-1
Our Price: $26.95

This water quality tester accurately measures the TDS level in your tap (feed) water and purified (product) water - enables you to determine just how good or bad your water really is! Use the meter to determine when the reverse osmosis membrane needs replacing.