【Wide Use】: The TDS tester can be widely used in water purifiers and filters, food (vegetables, fruits) and beverage quality control, swimming pools and spas, aquariums, hydroponics, etc. 【Three Test Modes】: The measuring principle of the TDS meter is to measure the conductivity of water, which indirectly reflects the TDS value. With the hold function, you can record the measurement results, read and save. Three test modes: ON/OFF is the switch button, HOLD is the lock button, and TEMP is the mode key, which can be adjusted according to personal needs. 【Easy to Use】: The TDS tester can detect some impurities in water, such as soluble salts, ionic organic compounds, heavy metal ions, etc., which provides great convenience for you and your family to get cleaner water. No matter where you are, traveling/playing/shopping, check the TDS value of the water at any time with a measurement accuracy of ±2%. 【Auto-off Function】: If no operation is performed for 5 minutes, the TDS tester will