Musical instruments can be easily damaged by large and rapid changes in humidity and temperature. Now you can protect your investment by simply placing D’Addario’s Humiditrak or TKL’s Safe & Sound with Blustream Technology inside your instrument or case. Humiditrak and Safe & Sound use a patent-pending Bluetooth sensor to provide a constant stream of temperature, humidity, and impact data to the free smart phone app to alert you of hazardous conditions that can lead to diminished playability, c