1Better Humanization: When the water quality tester is disconnected from Bluetooth without operation, it will automatically shut down in 8 minutes. When the water quality tester needs to be tested, the Bluetooth system will automatically connect, making it more user friendly. 2Bluetooth 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. 3Reliable Performance: Water quality testing pen supports email data export function, sent hourly, daily, weekly, and monthly in the form of email. 4Supported Languages: Language support for Chinese, Traditional Chinese, English, French, German, Russian, Japanese, Korean, Spanish. 55 in 1 Function: Water quality testing pen has EC TDS SALT S.G TEMP five in one function detection, providing you great using experience.1 x Water Quality Testing Pen 1 x Manual