Multi-function: test water Tds value, EC, also has a function to measure water temperature and ambient temperature (this product can not test PH). Large digital LCD screen: With the large digital screen, it is very easy to read the number displayed on the LCD screen Precise measurement: titanium alloy electrode and strong anti-rust ability, high detection, easy to measure, very accurate measurement (when using this product. The solution should not be liquid leakage affects the measured value.) Auto-off function: low power, after 5 minutes , it will automatically stop working. More energy saving Usage: Ideal for testing water purifiers and filters, swimming pools and SPAs, aquariums, hydroponics. It is is a digital TDS water quality tester for drinking water, swimming pool water, aquarium and spas. Feature: < p> 5 minutes of automatic shutdown function, the battery does not run out Lock function; easy to read and record, reading instrument locks Specifications: Net weight: 51g< /p> TDS: 0-9990 ppm Conductivity: 0-9990 us/cm < p >F: 32-176 Accuracy: 2% Celsius: 1 -80 Size: 152289mm