1. Bluetooth Features: The product is for Tuya APP compatible for IOS for Android mobile phones, and mobile phones and devices can transmit real time data within 10 meters. 2. Humanized Design: The product instrument in the case of no operation, disconnect Bluetooth, 8 minutes automatic power off, when the instrument is needed to test, open the Bluetooth system automatic connection, better humanized. 3. Language System: Language support Chinese, Traditional Chinese, English, French, German, Russian, Japanese, Korean, Spanish. 4. Accurate water measurement, care for the whole family's drinking water health. 5. 5 in 1 (EC / TDS / SALT / S.G / TEMP) Measure Range: EC: 0-19900us / cm; 0-199.0 /cm TDS: 0-19900ppm; 0-199.0ppt SALT: 0-199.0ppt; 0%-20% S.G: 0.990-1.400 Temp:0C-50c(32F-122F) Resolution: EC:1 us/cm(Less than1999us/cm); 10us/cm(Greater than1999us/cm); 0.1ms/cm TDS:1ppm(Less than1999ppm); 10ppm(Greater than1999ppm); 0.1ppt SALT:1ppm(Less than1999ppm); 10ppm(Greater than1999ppm); 0.1ppt; 0.01% S.G: 0.001 Temp: 0.1C (0.2F) Accuracy: EC,TDS,SALT: 2% F.S Temp: 1.0C Temperature Compensation: 0C-50C Working Temperature: 0C-50C size: 326 x 38 x 25MM Material: ABS colour: green Package Contents: 1 x Water quality tester (with 1 x 9V batteries) 1 x English instructions 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.