Humiditrak - Bluetooth Humidity and Temperature Sensor is the world's first 24/7 instrument monitoring system. Keep track of the humidity and temperature levels of all your instruments with a discreet Bluetooth sensor, free app and push notifications. Onthe road or on stage, Humiditrak has your back. When dangerous conditions are detected, it sends push notifications to your device (phone, table, PC), so you can take action before damage occurs.