MULTIFUNCTIONAL TESTER: 5 in 1 Water Quality Tester easily measures pH / TDS / EC / Salinity and temperature of liquid sample to judge water purity or pollution. HIGH ACCURACY: High-precision algorithm chip and efficient sensitivity electrode ensure fast and accurate response. Thanks to the precise ATC, the pH/TDS/TEMP function can accurately read sample values over a wide temperature range from 0 to 60, which solves the problem of inaccurate measurements caused by variations in temperature. liquid temperature. AUTOMATIC CALIBRATION: The digital pH meter is calibrated at the factory, but recalibration is required after long periods of inactivity or after frequent use. pH 4.00/pH 6.86/pH 9.18 calibration powders are included. You can calibrate effortlessly to ensure measurement accuracy. HIGH QUALITY PH METER: The green backlit LCD display design ensures reading results in any condition. The one-button reading lock feature allows you to lock the reading even if the tester is removed from the sample! IP67 is an international water and dust proof certification. Protection against dust intrusion and short-term immersion. COMPACT AND VERSATILE - It is very suitable for family use and is a good choice for the health of family and friends. You can use this compact and contained pocket tester (batteries included) to measure your aquarium, swimming pool, garden pond, bathtub. It can also be used to measure drinking water, reverse osmosis system, spa, soap mixes, food, wine, beer or other liquids.