D'Addario Guitar Humidifier - Acoustic Guitar Soundhole Humidifier with Sponge - Non Drip - Suspends from Strings

The simple design and cheap to buy does exactly what I need. It allows the humidification of the inside of my guitar whilst it is in its case. Pushing it into the round hole of the acoustic guitar is easy between the middle stings. Very easy to check whether sponge needs water and replace.

Bought this to use with the guitar during the hot dry season, but it's useful whenever the humidity is low to keep the instrument safe. Easy to use and value for money.

Easy to use.Nothing to replace.No money.Just do not make the sponge to wet.Check every three days.Does it work.Time will tell.

Works great, and I like the fact that it's completely reusable where other products require you to keep buying humidifier packets. A feature that wasn't obvious before I bought it is that it has grooves on either side so that it doesn't move about when clipped between the strings. This means it won't fall out or come into contact with the body of the guitar when moved around. Definitely worth buying for peace of mind if you have a decent guitar.

This is an ok contraption, if you are good at remembering to fill the sponge every third day when it's really dry. I don't so I cannot use this for my expensive guitar. Also, in that regard; it does not regulate humidity, it just adds humidity, so you have to watch out that the guitar does not gets "too wet". That too can damage an instrument. There are better solutions for your top end instrument. It looks ok and fits well between the strings of the guitar. Easy to fit, but a bit awkward to fit the sponge back into the container, as it has not really been cut to fit the space it's given. No big problem, just a design glitch.

Ultimately it’s a piece of wet sponge in a plastic housing, but don’t saturate it and it keeps the Guitar clean and dry while regulating moisture. Does all it needs to do. You don’t need anything more.

A simple item that does the job perfectly. No need for much more expensive fancy dehumidifiers

I bought this for my Gibson Hummingbird in the very hot weather. Easy to use - slightly tricky getting to stay in place but all in all well worth having.