D'Addario Humidikit - Humiditrak - Humidipak BundleThe DAddario Humidikit all in one humidification maintenance and monitoring system gives you everything you need to ensure your instrument stays safe and playable. The system includes a DAddario Humiditrak with Blustream Technology to provide a constant stream of temperature, humidity, and impact data directly to your smartphone via Bluetooth.* It also contains a Humidipak Starter Kit, featuring Bovedas patented two way automatic humidity control