I use the Oasis humidifiers in all my acoustics. They work well, and need checking and/ or refilling once a week. They never drip as long as you wipe the outside before placing in your guitar. I've seen a few guitars for sale (Froggy Bottom, Santa Cruz, etc.) that had reduced sale prices due to water stains on the guitar label from leaky humidifiers.
What kind of guitar you getting if you don't mind me asking?
