Inkbird Data Bluetooth Logger Smart Sensor Temp RH Monitoring Device   Display Recorder Wireless Android iPhone Inner Sensor External Probe Magnetic Back Temperature Thermometer Humidity Hygrometer Attention: Since the upgradation of SDKSoftware Development Kitto the latest version 26,it is necessary to launch the GPS to tag your position for scanning bluetooth device,which are applicable to the version starting from 23. Multiple Devices: One mobile phone can monitor more than one sensor and one sensor can be monitored by more than one mobile phone. Accurate (Humidity and Temperature accuracy is 2%RH and 0.5F) and fast response. Use the new generation of France HTU21D temperature and humidity sensors. Power consumption will be lower and working life will be longer. Temperature and humidity displayed on screen. Monitoring range: 50 meters / 150ft (No obstructions).Temperature Range: -40 ~140F (Inner sensor) -40~212F (External probe). Humidity Range: 0~99%RH. Inside and external probe are supplied. External probe can monitor the temperature of liquid. C /F mode and with magnet. Engbird app can be applied to IOS and Android system and support multi-language. History and Immediacy data can be remotely checked through Bluetooth. Hold data for 20 days if the sampling interval is 1min, the max date storage is 30000 point. Different sampling interval (10s, 30s, 1min, 2min, 5min, 10min, 30min) can be setting. The saving data time will be different if you choose different sampling interval.