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HydroMaster Digital testers make monitoring water easier than ever by reading the levels that matter most and providing accurate readings that you can depend on. Continuous pH/EC/TDS/Temp monitor with rechargeable battery. Portable, wall mount, or benchtop use. HydroMaster HM-500 pH/EC/TDS/F Tester (113831) Tests pH at a range of 0 pH-14 pH, temperatures from 30F-176F, TDS from 0-9999 ppm and EC from 0-9999 S Stores up to 20 measurement readings, so you can monitor changes over time LCD touch-type screen with auto backlighting Powered by a rechargeable lithium ion battery Features an adjustablealarm that has a high and low set point Automatically turns off after 5 minutes Comes with wallmountable bracket, USB cable, 2 flotation disks,1 EC/TDS conductivity sensor, 1 pH sensor, 1 packet each pH 4, pH 7, storage solution, and 1000 ppm calibrationsolution 110V-220V Three year warranty (6 month warranty on thepH probe)