1.[Wide Usage PH Meter]This digital ph tester can be applied in the following applications,drinking water quality test, swimming pool salt tester, salinity tester for saltwater aquarium,soil ph meter,PH balance measurement in RO/DI system, lab ph meters, hot tub or hydroponics. 2.[5-in-1 PH Meter for Water] PH meter is designed with 5-in-1 function, which can be measured PH, TDS, EC, SALITY, and Temperature.All-round measurement of water quality to ensure y water quality. 3.[Easy to Operate & LCD Display]Easy to operate, even beginners can use it with confidence. [High Accuracy ph tester]The digital water quality meter's high precision algorithm chip and electrodes ensure accurate and quick response. Once the reading has stabilized, simply press the HOLD/TEMP button to lock the reading and take it out for viewing.LCD display makes it easy to read the measurement value in numbers; Auto-shutdown function turns off the power within 5 minutes to save power. A fully transparent liquid crystal display (LCD) is used to display four-digit numerical values and the corresponding units of physical quantity. 4.[ and dustproof]Prevent dust and soak for a short time, (Can be used even if dropped into an aquarium) The glass bulb at the tip of the PH pen is easily broken, so please be careful when using it or drying it.