【HIGH-PRECISION DIGITAL HYGROMETER】: High-precision digital temperature and humidity meter, powerful probe sensor. Short response time, strong anti-interference ability, and more accurate data collection, for a wide range of applications. 【FLEXIBLE】: Use just the sensor and your phone via Bluetooth for data. Receive notifications when conditions exceed min/max alarm settings. No matter the environment around or the way you place it, it doesn’t require much of space and can be working stably, saving distinct data for up to 2 years and showing the trend on your phone. 【DURABLE】: This sensor can work perfectly between -10°C - 50°C, with the humidity range 20%-99% RH. Equipped with 1 x 3V CR2450 button cell, which ensures long-time use between each battery swap.