High Accuracy---Make Sure The Ph Of Your Pool, General Hydroponics Or Even Drinking Water Has Perfect Ph Balance And Can Be Used Safely With The Ph Accuracy Of Ph Meter. The Ph Tester Features A Sensitive Electrode Sensor To Read Accurate Ph Levels.User-Friendly Design --- Automatic Temperature Compensation, Replaceable Electrode Probe, Easy Ph And Ec Calibration With A Mini ScrewdriverMulti-Function - 3 In 1 Meter Design. It Can Be Used To Measure Ph, Ec And Solution TemperatureTemperature Measurement Range And Lcd Display---Temperature Measurement Range Between -50~70, Able To Withstand Harsh Conditions, Providing More Sustainable Services; Large And Clear Lcd Display With Backlight, Easy To Read And Accurately Measure Functions Specification --- Power Supply: Dc 6V; Battery: 4 * 1.5V Ag - 13 Battery (Included); Operating Temperature: 0~50/32~122; Compensation Temperature: 0~50/32~122; Accuracy: Ph: 0.1 Ph; Ec: 2% Fs; Temperature: 1 (2); Resolution: Ph: 0.01Ph; Ce: 10Us/Cm; Temperature: 0.1 (0.2). Measurement Range:Ph:0.00~14.00Ph' Ec:0.00~19990Us/Cm; Temperature: -50~70/-58~158