Widely used in aquarium, glass fishpond, pharmaceutical research, agriculture, laboratory, water environment, quality control and other fields. Features: Easy to use, high accurancy. Quick and easy installation and operation. EC: Support 3-point calibration automatic identification (1413us 12.88ms and 111.8ms) Built-in 3 calibration points (1413uS-cm 12.88ms -cm 111.8ms -cm) PH:1 point (6.86) or 2 point (6.86 4.00) (6.86 9.18) or 3 point (6.86 4.00 9.18) can automatically identify the calibration solution. This is a professional water level test instrument, the operation is simple, the appearance of fashion, small size and easy to put in your pocket. Has automatic temperature compensation. 5 minutes no operation, the meter will automatically shut down. Save power, extend battery life. (Battery is not included) With backlight function, it is more convenient to read. Specifications: Material: ABS EC:? Measuring range: 0 to10000uS-cm 10.01-19.99ms 20.1-400ms -cm Resolution: 1uS-cm; 0.1 mS-cm; Accuracy: and- 2% of the reading TDS:? Measurement range: 0 to 1000ppm 1000ppm to 10000ppm 10.1 to 200.0 PPT Resolution: 1ppm; 0.1 PPT Accuracy: and- 2% of the reading Salinity:? Resolution: 0.01% Accuracy: 0.01-5.00% (and- 0.1%) 5.10-25.00% (and- 1%) PH: Measuring range: 0.01-14.00pH Resolution: 0.01pH Accuracy: and- 0.05pH Operating environment: 0 to 60.0 celsius (32.0-140 Fahrenheit ); RH TDS factor: 0.4 to 1.0 Temperature range: 0.1-60.0 celsius 32.0-140 Fahrenheit Temperature accuracy: and- 0.5 celsius Temperature resolution: 0.1 celsius - Fahrenheit Battery: 3 x LR44 (not included) Waterproof rating: IP67 Display size: 33 x 24mm Item size: 180 x 37mm - 7.1 x 1.5in Item weight: 86g - 3.0ounce Package size: 183 x 37 x 37mm - 7.2 x 1.5 x 1.5in Package weight: 90g - 3.2ounce Packing List: 1 x Water Quality Monitor Tester 3 x PH Buffer Powders