What size battery does a guitar tuner take?
The tuner uses 1 CR2032 (3 volt) battery. To replace battery, open the battery drawer, remove the old battery and--- replace with fresh one, taking care that the positive terminal (+) is directed upwards when placed in the battery door (plus side toward back side of tuner).
Do clip on tuners damage guitars?
No damage . won't vouch for any other make as there may be some that do damage , but before this tuner and guitar an intellitoich was pretty much permanently on my guitar.