Widely used in aquarium, 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) Specifications: Type: with backlight, without backlight (optional) Material: ABS EC:? Measuring range: 0 to10000uS/cm 10.01-19.99ms 20.1-400ms /cm Resolution: 1uS/cm; 0.1 mS/cm; Accuracy: +/-2percent of the reading TDS:? Measurement range: 0 to 1000ppm 1000ppm to 10000ppm 10.1 to 200.0 PPT Resolution: 1ppm; 0.1 PPT Accuracy: +/-2percent of the reading Salinity:? Resolution: 0.01percent Accuracy: 0.01-5.00percent (+/-0.1percent ) 5.10-25.00percent (+/-1percent ) PH: Measuring range: 0.01-14.00pH Resolution: 0.01pH Accuracy: +/-0.05pH Operating environment: 0 to 60.0 celsius (32.0-140 Fahrenheit ); RH 100percent TDS factor: 0.4 to 1.0 Temperature range: 0.1-60.0 celsius 32.0-140 Fahrenheit Temperature accuracy: +/-0.5 celsius Temperature resolution: 0.1 celsius / Fahrenheit Battery: 3 * LR44, 1.5V, 160mAh Waterproof rating: IP67 Display size: 33*24mm Item size: 180 * 37mm / 7.1 * 1.5in Item weight: 86g / 3.0ounce Package size: 183 * 37 * 37mm / 7.2 * 1.5 * 1.5in Package weight: 100g / 3.5ounce Packing List: 1 * Water Quality Monitor Tester 3 * PH BufferPowders 1 * PH TestPaper