Widely used in aquarium, glass fish pond, pharmaceutical research, agriculture, laboratory, aquatic environment, quality control and other fields. Functions: Easy to use, high accuracy. Quick and easy installation and operation. EC: Support automatic identification of 3-point calibration (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 points (6,86 4,00) (6,86 9,18) or 3 points (6,86 4,00 9,18) can automatically identify the calibration solution. It is a professional water level measuring instrument, the operation is simple, fashion appearance, small size and easy to put in your pocket. It has automatic temperature compensation. 5 minutes without operation, the meter will turn off automatically. Save energy, extend battery life. (Battery not included) Thanks to the backlight function, it is more convenient to read. Specifications: Material: ABS IN: Measuring range: 0 to 10000 uS / cm 10,01-19,99 ms 20,1-400 ms / cm Resolution: 1uS/cm; 0,1mS/cm; Accuracy: ± 2% reading TDS : Measuring range: 0 to 1000 ppm 1000 to 10000 ppm 10,1 to 200,0 PPT Resolution: 1 ppm; 0,1 PPT Accuracy: ± 2% reading Salinity: Resolution: 0,01% Accuracy: 0,01-5,00% (± 0,1%) 5,10-25,00% (± 1%) PH: Measuring range: 0,01-14,00pH Resolution: 0,01pH Accuracy: ± 0,05 pH Working environment: 0 to 60,0 ℃ (32,0-140 ℉); RH 100% TDS: 0,4 to 1,0 Temperature range: 0,1-60,0 ℃ 32,0-140 ℉ Temperature accuracy: ± 0,5 ℃ Temperature resolution: 0,1 ℃ / ℉ Waterproof: IP67 Display Size: 33*24mm Product Size: 180*37mm/7,1*1,5inch Item Weight: 86 g / 3,0 oz Package Weight: 90g / 3,2 oz List of things to pack: 1 * Water Quality Monitor Tester 3 * PH buffer powders