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USE THE TDS METER TO- • Check the performance of your water filter • Check for hardness(1 grain=17ppm) • Make sure you always drink pure water FEATURES- Hold fuction: Saves measuring for convenient reading and recording. Auto-off fuction: Turn off meter alter 10 minute of non-use to conserve batteries. Dual Range: Measures from 0-999ppm, with a resolution of 1 ppm. From 1000 to 9.990 ppm, the resolution is 10ppm, indocated by dinking x 10 symbol, Factory calibrated.