Feature: 1. It is widely used in tap water/household water purifier/commercial water purifier/industrial treated water, etc. 2. High quality titanium alloy probe, high test accuracy, to ensure data accuracy. 3. Three measurement modes are used for proofreading, which can test TDS value, Celsius, and Fahrenheit respectively. 4. 5 minutes automatic shutdown, and it will automatically shut off if not used in five minutes, saving power and worry. 5. The measurement range is wide, the measurement range is 0-9990ppm, and the resolution is 1ppm. Specification: Item Type: TDS Meter Material: ABS Color: As shown in the picture Weight: Approx.48g/1.7oz Test Item: Water purity Measurement Category: TDS value/Celsius/Fahrenheit Battery: 2 x LR44 button batteries (not included) TDS Range: 0-9990PPM Resolution: 1PPM Accuracy: ±2% Temperature Range: 0-45℃ Application: Tap water/household water purifier/commercial water purifier/industrial treated water, etc. How to Use 1. Do not use dusty containers to test the water quality. It is recommended to use glass containers, but the regular simple test and trial disposable cups have little effect, and the error will be +3%. 2. Press the TEMP key to switch to temperature mode first. When switching to temperature mode, the "℃" symbol will appear in the upper right corner of the display. 3. When testing the water temperature, the value will fluctuate. When there is no change in the value, record the current temperature value. 4. Finally, press the TEMP key twice to switch twice to enter the final TDS value test mode. 5. Enter the TDS value test mode, the PPM unit will be displayed in the lower right corner, and when the value stops unchanged, it will be the final real-time test value. . Package List: 1 x TDS Meter(Battery Not Included)1 x Instruction Manual Note: Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.