On-Stage GA150 Acoustic Guitar Humidifier (Black)

Not the best option

The GA250s are made of hard plastic that can damage an instrument top if dropped; the lid does not open, so judging the dryness of the sponge is guesswork and there is no way to tell when/if the sponge gets moldy and replace it; the humidifiers are so small that they have to be topped off frequently, and using the required eye-dropper to refill them is tedious.

Reviewed on B&H Photo Video