NIUNIU TDS Water Quality Test Pen EC Meter Conductivity Test Pen Celsius Fahrenheit Three-in-One Drinking Water Test Digital TDS Meter TesterTo Test the Filter Water Quality Purity, to Check the Performance of Your Water Filter, to Check for Hardness,to Make Sure You Always Drink Pure Water Shift between TDS and ConductivityHold Button Saves Measurements for Convenient Reading and Recording New Arrival Wide Measurement RangeEC: 0-9990us/cm. TDS: 0-9999ppm. Dearees Celsius: 0.1-80.0 Celsius. Fahrenheit: 32.0-176.0 Accuracy: 2% Auto-off FunctionTurns off Meter after 5 Minutes of Non-use to Conserve BatteriesAutomatic Temperature Compensation MultifunctionalCan be Used in Water Ppurifiers and Filters, Food(Vegetable, Fruit) Drink Quality Monitoring, Pools and Spas, Aquarium, Hydroponics color: White Size: 152*30*14mm Quantity: 1pc 1.As different measuring methods,it will occur 1-3 cm deviation about the items,please ensure that it is okay for you before ordering. 2. Because of different monitors and lamplight, the picture may not reflect the actual color of the item, really thank you for your kind understanding. 3. Only the above package contents, excluding other products.