Features: AUTOMATIC CALIBRATION: With automatic identification, three-point calibration, equipped with a calibration powder pack to allow common conductivity buffer solution to calibrate and automatically detect when in calibration modes and read the digital in no time. The function can reduce the error caused by the change in liquid temperature and improve accuracy LED BACKLIT & LED backlit, information, easy to read, clear display and readability of data even in the dark. Pocket and handheld size, lightweight, easy to take anywhere. Equipped with a 5minute automatic shut-off function, which saves power and extends life of the battery. Removable probes designs, prevents accidental damage to the probes from increasing cost of replacement, more convenience. Waterproof and durable: the TDS meter water tester with IP67 international highly waterproof and dustproof. Can protect against dust penetration and short-term immersion. It can still work normally even if dropped in water. Wide application: the water tester can test the quality of drinking water, pool, aquarium, SPA, aquaculture or hydroponics, very suitable for plant laboratories, aquaculture and domestic use. Specifications: Material: Plastic Ranges PH: 0.00-14.00±0.05 TDS: 0-200000ppm EC: 0-200000UScm Salts Content: 0.00-25.00% Temperature 0-60°C(RH 100%) Waterproof Level: IP67 Size: Approx. 18.3x3.7cm/7.20x1.46in Package Includes: 1 Set Water Quality Tester note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.