①. [5-in-1 Water Quality Test] The pH meter is designed with 4-in-1 function, which can measure pH, TDS, EC, salinity and temperature at the same time. Omnidirectional water quality measurement to ensure water quality. ②. [Precise Measurement] It is equipped with a probe and reliable automatic temperature compensation (ATC), which helps ensure readings at different temperatures. ③. [Auto-off function] The power-off function automatically turns off the power after 5 minutes of no operation to save energy. ④. [IP67 waterproof grade] IP67 is an international waterproof and dustproof certification. Protection against dust ingress, short-term immersion. ⑤. [Wide range of applications] This water quality detector is suitable for testing water, swimming pools, aquariums, spas, hydroponics, laboratory and drinking water, etc.