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, it's 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 savings Usage: Ideal for testing water purifiers and filters, swimming pools and SPAs, aquariums, hydroponics. This is digital TDS meter tester for testing water quality for Drinking water, Swimming pool water ,Aquarium and SPAs. Feature: 5 minutes auto shut-off feature, battery does not run off Lockout 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: 152 28 9mm Usage Steps: ? Please unplug the sleeve electrode protectors before use. ? Press the switch. place the electrode in the test solution. ? After numerically stable, press the HOLD button and take it out of the test solution to read. ? After reading. turn off the player. wipe the electrode before sheathing. Shift between TDS and Conductivity: ? Factory TDS data. if solution conductivity data is required. please press the SHIFT button, the instrument will automatically shift. Temperature Offset: ? Continuously press the SHIFT button twice, degrees Celsius and degrees Fahrenheit converted, the factory default degrees Celsius. Attention: Manual is in Chinese and English, if you need the manual in French, please let me know. Avoid heat, direct light exposure Please do not throw the instrument into the test solution to avoid the circuit board short circuit Keep the battery clean, cover electrode protective cover, if not use for a long time please remove the battery when using this product. The solution should not be runny. Flowing liquid affects the measured value.