Description: This water quality detection pen is accurate in value, and the value can be obtained within 3s. With automatic water temperature compensation function, it can be adjusted according to water temperature and water quality. Features: 1. Stable within 3S, numerical error ±2%. The value can be locked manually or automatically. 2. Three functions: TDS detection, EC detection, and water temperature detection. Feel free to switch. 3. The large LED screen backlight makes the reading clearer. 4. If there is no new test item in the 60s, it can automatically shut down. 5. Very suitable for water quality testing in spas, fish tanks, domestic drinking water, swimming pools, and outdoor drinking water. Specifications: Name: TDS Water Quality Test Pen Function: TDS value test ppm (mg/l), conductivity test μs/cm, Fahrenheit temperature test ℃, Celsius temperature test ℉, with backlight, range: 0-9999 TDS Pen Operating Instructions: 1. Press ON/OFF, power on, LCD display default PPM test. 2. Press MODE to realize the test function selection, select in turn: PPM, conductivity μs/cm, Celsius temperature ℃, Fahrenheit temperature ℉. 3. After the test item is selected, the test will proceed automatically, and the reading will be automatically locked after the data display is stable. If you need to manually lock, you can press the CLEAR key. If you need to re-test, you can press CLEAR to clear it, and then enter the re-test. 4. After starting the work, no new operation action is performed, and the test pen will automatically shut down after 60s. 5. Keep pressing the on/off/hold key for 3 seconds to automatically shut down the machine manually. 6. After use, clean the test head and store it properly. Packing List: Water Quality Test Pen*1 Note: Due to the lighting effects and shooting angles, there is color difference in the product, please understand. Due to manual measurement, there is a tolerance in the product size.