1. Better Humanization: When the water quality tester is disconnected from Bluetooth without operation, it automatically shut down in 8 minutes. When the water quality tester needs to be tested, the Bluetooth system automatically connect, making it more user friendly. 2. Bluetooth BT Features: The water quality tester is compatible for IOS and for Android phones, support for Tuya APP. The phone and device can transmit real time data within a distance of 10 meters. 3. Reliable Performance: Water quality testing pen supports email data export function, sent hourly, daily, weekly, and monthly in the form of email. 4. Supported Languages: Language support for Chinese, Traditional Chinese, English, French, German, Russian, Japanese, Korean, Spanish. 5. 5-in-1 Function: Water quality testing pen has EC TDS SALT S.G TEMP five in one function detection, providing you great using experience. Item Type:Water Quality Tester Battery:2 x CR2032 Button Battery Scope: EC:0-19900us/cm 0-199.0 ms/cm TDS:0-19900ppm 0-199.0ppt SALT:0-199.0ppt 0% -20% :0.990-1.400 Temperature:0°C-50°C (32°F-122°F) Resolution: EC:1us/cm (1999us/cm), 0.1ms/cm TDS:1ppm (1999ppm), 0.1 ppt SALT:1ppm (1999ppm) Accuracy:EC, TDS, SALT: ± 2% F.S Temperature Compensation:0°C-50°C Working Temperature:0°C-50°C Language Support For Chinese, Traditional Chinese, English, French, German, Russian, Japanese, Korean, Spanish Colour:White & Green Material:ABS Size:.18x4x1.5cm/7.1x1.6x0.6in Package Contents: 1 x Water Quality Tester Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.