Product review (5 stars): A must own for every string player
This is a much-needed device for string instrument owners!! The unit tracks humidity/temperature changes and can be set to alert you based on criteria you decide (alert me when humidity drops below or above specific levels). It also shows you humidity/temperature changes over time so you know what changes your instrument has been through. These are stored on the device and downloaded to your phone when you are in bluetooth range. The genius of this device is that you can take a humidity reading in your case without opening your case and disturbing the current humidity level.
The designers also did a great job by making the system easy to read multiple Humiditrak devices, presumably in different cases monitoring different instruments. This makes it easy to keep tabs on all of your instruments without unnecessarily disturbing the humidity levels in each case.
Coupled with the D'Addario humidity control product (Humidipak), this device makes maintaining proper humidity levels very easy. I only wish that D'Addario would market these devices to all string players - not just guitarists.
My only complaint is that currently you cannot calibrate the humidity sensor. We all know that capacitive type hygrometers (of which Humiditrak is) can drift over time. It is easy to compensate for this by calibrating the sensor to a known humidity level. One can use table salt and water (this will give you 75% relative humidity) to do this or other types of salt that level off closer to a humidity level where you will store your instrument. This is the exact same principle by which the Humidipak system operates to give you a relatively consistent humidity level of 50%. A calibration feature, however, could easily be added to the Humiditrak app in a future update.
This product is a must-own for any serious string instrument player.