Features 4 IN 1: The water quality test pen has four functions, which can measure temperature, TDS, EC, PH, meet various detection needs. HIGH SENSITIVITY: High sensitivity alloy probe and glass electrode are used to measure water quality with high accuracy, and automatic temperature compensation can be used to reduce errors. BACKLIT DISPLAY: The backlit display is automatically turned on when the machine is turned on, and the value can also be seen clearly in dim conditions. UNIT SWITCHING: The instrument has the temperature unit switching function, which is very convenient and practical. WIDELY USED: The water tester can be used for domestic water, swimming pool, aquaculture, environmental water quality, agricultural water, fish tank, greenhouse flowers, barreled water, community water station, etc. Specification: Item Type: Digital Water Tester Material: ABS Battery: Button battery LR44 x 4 (without battery) Application: Domestic water, swimming pool, aquaculture, environmental water quality, agricultural water, fish tank water quality, greenhouse flowers, barreled water, community water station Basic Parameters: TDS: 0-9999ppm EC: 0-9999μS/cm pH: 0.00-14.00ph TEMP: 0-60℃ (32-140℉) Package List:1 x Digital Water Tester1 x User Manual3 x PH Test Reagent Package List 1 x Digital Water Tester 1 x User Manual 3 x PH Test Reagent