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 pH-14 pH, temperatures from 30?F-176?F, 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. Includes a rechargeable lithium ion battery. Features an adjustable?alarm that has a high and low set point. Automatically turns off after 5 minutes. Comes with wall?mountable 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 calibration?solution.