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 014 pH, temperatures from 30F176F, TDS from 09999 ppm and EC from 09999 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 adjustablealarm that has a high and low set point. Automatically turns off after 5 min. Comes with wallmountable 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 calibrationsolution.