Multifunctional:Tests water Tds value, EC, also has a function of measuring water temperature and ambient temperature(This product cannot test PH.) Large Digital LCD Display: With the large digital display, its very easy to read the number displayed on the LCD Precise Measurement: Titanium alloy electrode, and strong antioxidant capacity, high detection, easy to measure ,very accurate measurement(When using this product. The solution should not be runny. Leaking liquid affects the measured value.) Auto-Stop 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. This is TDS meter tester digital water quality tester for Drinking water, Swimming pool water, Aquarium and SPAs. Feature: 5 minutes auto-off feature, battery wont run off Lock feature; easy to read and record, the instrument locks reading Specifications: Net weight: 51g TDS: 0-9990ppm Conductivity: 0-9990us/cm F: 32-176 Accuracy: 2% Degrees Celsius: 1-80 Size: 152289mm