Apply in water sources, aquarium, hydroponics, laboratory and scientific testing, spas, swimming pools and other water systems. 3-in-1 meter design. It can be used to measure the TDS, EC and temperature of the solution. Large and clear LCD with backlight, easy to read and accurately measuring functions. Pen type, small size, lightweight, easy to carry and simple to operate. Easy calibration of TDS and EC with just a mini-screwdriver. Electrode probe can be replaced, ATC function.Automatic temperature compensation. Test temperature in / (switchable unit). Specification: Condition: 100% Brand New Item Type: Water Quality Tester Material: ABS Color: As shown in the picture Size: Approx.185x36x17mm/7.28x1.42x0.67in Weight: Approx.139g/4.9oz Measuring Range: EC: 0 ~ 19990us / cm TDS: 0-19990ppm Temperature: -50 -70 (-58 -158 ) Resolution: EC: 10us / cm TDS: 10ppm Temperature: 0.1 C (0.2 F) Accuracy: EC / TDS: 2% FS Temperature: 1 ( 2 F) Power Supply: 4 x 1.5V button battery (Not included) Compensation Temperature: 0 -50 Package List: 1 x Water Quality Tester 1 x Screwdriver 1 x Instruction Manual