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 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 antioxidant capacity, high detection, easy to measure, very precise measurement (When using this product. The solution should not be flowing. The flowing liquid affects the measured value.) Automatically Shuts Off 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. <p >This is a digital TDS meter tester to test water quality for drinking water, swimming pool water, aquarium and SPAs. Feature: 5 minutes auto shut-off feature, battery does not work out Lock function; easy to read and record, the instrument locks the 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 the numerically stable, press the HOLD button and take out 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 needed. Please press SHIFT button, the instrument will shift automatically. 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 instructions in French, please contact me. Avoid heat, exposure to direct light Please do not throw the instrument into the test solution to avoid short circuit of the circuit board 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.