Oasis HH Combo OH-30 Guitar Hygrometer/Humidifier


89 out of 100. Incorporating 100+ ratings and reviews.

Street Price: 

Oasis HH Combo OH-30 Guitar Hygrometer/Humidifier

Gearank Recommendation

The OH-30 earned a spot on our recommended list for Guitar Humidifiers & Hygrometers from February 2021 until September 2022.


The Oasis HH Combo OH-30 is a digital hygrometer and humidifier packed in a compact profile that hangs in between the strings on the soundhole.

It provides humidity and temperature readings right on its built-in display, so you get immediate visual feedback which removes any guesswork in keeping your guitar within safe humidity levels.

Inside the unit is a polyvinyl acetate sponge that holds water as much as 10 times its weight, and can do so for up to 15 days before needing maintenance via moistening with distilled water. It also features multiple openings for water vapor to escape in dry climates.


  • Weight: 0.32 oz
  • Suspension: Held By Strings
  • Longevity: Long
Although this was previously on our recommended list, there are now more highly rated options in our guide to The Best Guitar Humidifiers & Case Hygrometers.