Can you use it for a Mini Guitar?

It is designed to be compatible with acoustic guitars (other than Gut strings), so basically it should be usable. However, with a “Mini Guitar”, you can not determine what the guitar is like, so it can not be determined until you actually install this. Although it says “mini”, there are various kinds of guitars such as medium scale, short scale, etc. There shouldn’t be a problem using guitars of that kind, but guitars such as “Guitalele” and other small guitars are not compatible with this. It is best to use “Standard Acoustic Guitars”.