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HydroMaster Digital tester makes 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. Tests pH at a range of 0–14 pH, temperatures from 30°F–176°F, TDS from 0–9999 ppm and EC from 0–9999 µS. Stores up to 20 measurement readings, so you can monitor changes over time. LCD touch-type screen with auto backlighting. Includes a rechargeable lithium ion battery. Features an adjustable alarm that has a high and low set point. Automatically turns off after 5 min. Comes with wall mountable bracket, USB cable, 2 flotation disks, 1 EC/TDS conductivity sensor, 1 pH sensor, 1 packet each pH 4 and pH 7, storage solution and 1000 ppm calibration solution.