Features: 4 in 1 Detecting Function: This water quality tester can measure pH, Total Dissolved Solids (TDS), EC, temperature, and chlorine in water to help you fully understand the water quality of the tested sample. Mobile Phone APP Remote View: After connecting correctly to your mobile phone via Bluetooth, all testing results can be viewed on the app. LCD Display Screen with Backlight: The display screen with backlight allows you to read the testing data clearly even in dim light or total darkness, and you can turn the backlight on or off using your mobile phone. IP67 Waterproof: The IP67 waterproof rating ensures the device can be used reliably in wet environments and provides long-term durability. Customizable Alarm Settings: You can set high or low limits for pH, EC, TDS, or ORP according to your needs. When test results exceed these ranges, the value will be displayed in red as an alert. Specifications: pH: Range: 0.1–14.0 pH Resolution: 0.1 pH Accuracy: ±0.1 pH Chlorine: Range: 0.1–4.0 mg/L Resolution: 0.1 mg/L Total Dissolved Solids (TDS): Range: 0–999 ppm, 1000–9990 ppm Resolution: 1 ppm, 10 ppm Accuracy: ±2% F.S. ORP: Range: -999 to +999 mV Resolution: 1 mV Accuracy: ±15 mV Temperature: Range: 0.1°C to 80°C (32.1°F to 176.0°F) Resolution: 0.1° Accuracy: ±0.5° Material: Plastic Color: Blue Package Contents: 1 x Water Quality Detector Note: Light reflection and differences in display screens may cause slight variations in the color of the item shown in the picture compared to the actual product. Measurement error allowance is ±1–3 cm.