Feature: 1. Backlight Function: Water quality tester pocket size, light weight, backlight function, you can measure anytime and anywhere. 2. Easy to Read: The test pen screen is designed to display horizontally, TDS value and temperature value can be read at the same time, making your work easier and more comfortable. 3. Function: No need to care about the temperature of the measured liquid, the TDS meter has automatic temperature compensation function, adjust to the water temperature and give the TDS value reading almost immediately. 4. Simple Operation: Turn on the switch, put the probe into the water and stir (so that the small glass ball is fully in contact with the liquid), wait for the value to stabilize and then read the value. 5. Scope of Application: Digital TDS meter is suitable for monitoring the water quality condition of fishbowl, measuring the TDS value of well water, alkaline tap water and other beverages. Specification: Item Type: TDS EC Water Tester Material: ABS Plastic Test Items: Water Purity Measurement Category: TDS Value, Celsius, Fahrenheit, Conductivity Battery Specification: CR2032x1 Button Cell (Included) TDS Battery Capacity: 240mAh TDS Range: 0 to 9999PPM Temperature Range: 0.1 to 80 Degrees Celsius Application Range: Tap Water, Household Water Purifier, Commercial Water Purifier, Industrial Water Treatment Industry, Etc. Color: Blue. Package List: 1 x TDS EC Water Tester (Ship with Inbuilt Battery)1 x User Manual1 x Storage Bag