This meter is the perfect solution for simple TDS, EC, pH, Salinity, and temperature measurements. All pH readings are automatically compensated with temperature (ATC). Features: Multifunctional Tester: has 5 kinds of functions including test TDS, EC, pH, salinity, and temperature of the liquids. ATC Function & Calibration: automatic temperature compensation and easy calibration with the included mini slotted screwdriver. High Precision Probe: accurately measure the water quality to protect the health of you and your families. Nice Quality Pen-type Design: ABS materials is lightweight yet durable, easy to operate. Waterproof Tester: battery compartment is well sealed with silicone ring, the whole pH tester is totally waterproof, it is no problem to soak it into water during test. Wide Application: suitable for water quality testing of drinking water, swimming pool, farmland irrigation, fish tank, etc. Specifications: Material: ABS RANGE: pH: 0.0~14.0pH EC: 0~1999μs/cm, 0~19.9mS/cm