Product review (4 stars): Great for any guitar owner.
I got this for my daughter who has a bass and a guitar in our house.  she transports them back and forth to school and often in the winter.  THis will help her to keep an eye on the humidity in the house and vehicle as they go to and from home.  It works great and really helps her to maintain great quality for her instruments.  Very good item for anyone with a stringed instrument.