Put it in your case and it tells you the humidity. It’s simple and easy.
If you own a classical guitar, regardless of its price, maintaining proper temperature and humidity is most important to prevent deterioration of the wood. I have been using this product since I bought my 1 st classical guitar 4 years ago, and it is the easiest way to always be aware of your guitar's environment.
I highly recommend this product! It can't be any easier than this to protect your investment!!!
I keep mine with a piece of velcro to keep it hung inside the case on the case.
Nice product; best price on internet. This Oasis is much more accurate than the others I have purchased.
Delivery was quick as well.