Features 1、Easy to use, high accurancy. 2、Quick and easy installation and operation. 3、EC: Support 3-point calibration automatic identification (1413us 12.88ms and 111.8ms) 4、Built-in 3 calibration points (1413uS/cm 12.88ms /cm 111.8ms /cm) 5、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. 6、This is a professional water level test instrument, the operation is simple, the appearance of stylish, small size and easy to put in your pocket. 7、Has automatic temperature compensation. 8、5 minutes no operation, the meter will automatically shut down. Save power, extend battery life. (Battery is not included) 9、With backlight function, it is more convenient to read. Specification 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 stylish, 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: ±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: ±2% of the 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: ±0.05pH Operating environment: 0 to 60.0℃ (32.0-140℉); RH 100% TDS factor: 0.4 to 1.0 Temperature range: 0.1-60.0℃ 32.0-140℉ Temperature accuracy: ±0.5℃ Temperature resolution: 0.1℃/℉ 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: 90g / 3.2ounce Packing List: 1 * Water Quality Monitor Tester 3 * PH Buffer Powders Package List 1 * Water Quality Monitor Tester 3 * PH Buffer Powders