Feature:1. APP Data Synchronization: This water quality tester can realize data sharing with mobile phones, automatic and manual storage or data can be exported to Excel for viewing and sharing. You have no need to worry about whether the data will be lost or not.2. Buzzer Alarm: You can set a limit to the data of PH EC ORP. If the test value exceeds the setting range, the value will be displayed in red and a buzzer will sound. In this way, you can better monitor the water quality.3. Multifunctional Electrodes: One electrode can measure seven kinds of values, PH, ORP, EC, TDS, CF, humidity, and temperature. You can use one machine to test them all. It is convenient and time saving.4. 2 Charging Methods: The water quality tester can be charged by 2 methods, 3 AAA batteries or a charger. For you to choose the most convenient one.5. Wide Application: The water quality tester is able to be used in different scenarios, like fish tanks, aquariums, mariculture, swimming pools, drinking water, laboratories, and so on.Specification:Item Type: Water Quality TesterMaterial: ABSAutomatic Temperature Compensation: 0.0-60.0°C; 32.0-140.0°FBattery: (1.5V AAA Alkaline Battery LR03) x 3 (Delivered Without Battery)ES: (Range: 0.01-19.9ms/cm, Accuracy: ±2%, Resolution: 0.01mS/cm)TDS: (Range: 0-9990ppm, Accuracy: ±2%, Resolution: 1ppm)CF: (Range: 0.1-199.9CF, Accuracy: ±2%, Resolution: 0.1CF)PH: (Range: 0.00-14.00PH, Accuracy: ±0.05PH, Resolution: 0.01PH)ORP: (Range: -999~999mV, Accuracy: ±15mV, Resolution: 1mV)Temp.: (Range: 0.1-80°C/32.1°F-176°F, Accuracy: ±0.5°C, Resolution: 0.1°C/0.1°F)Humidity: (Range: 10%-99%RH, Accuracy: ≤±2%RH/Year, Resolution: 1%RH)Calibration: (PH: 4/6.86