Widely used in aquarium, glass fish pond, pharmaceutical research, agriculture, laboratory, aquatic environment, quality control and other fields. Features: Easy to use, high precision. Quick and easy installation and use. EC: Support 3-point calibration automatic identification (1413us 12.88 ms and 111.8 ms) Built-in 3 calibration points (1413uS / cm 12.88 ms / cm 111.8 ms) / 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.< br/> This is a professional water level testing instrument, the operation is simple, fashion appearance, small size and easy to put in your pocket. Has automatic water level compensation temperature. 5 minutes without operation, the meter will automatically turn off. save power, extend battery life. (Battery is not included) With backlight function, it is more convenient to read. Features: Material: ABS CE: Measuring range: 0 to 10000uS/cm 10.01-19.99ms 20.1-400ms/cm Resolution: 1uS/cm; 0.1 mS / cm; Accuracy: 2% of reading TDS: Measuring range: 0 to 1000ppm 1000ppm to 10000ppm 10.1 to 200.0 PPT Resolution: 1ppm; 0.1 PPT Accuracy: 2% of 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: 0-60.0(32.0-140); Relative humidity 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 (not included) Waterproof rating: IP67 Screen size: 33*24mm Item size: 180 * 37mm / 7.1 * 1.5in Item Weight: 86g / 3.0 ounce Package size: 183 * 37 * 37mm / 7.2 * 1.5 * 1.5in Package weight: 90g / 3.2 ounces Packing List: 1 * Water Quality Monitor Tester 3 * PH Buffer Powders