218 Heriba guitar aquanizer OAS/OH-1 Oasis guitar soundhole humidifier Blue OAS/OH-5 Oasis guitar soundhole humidifier Yellow Plus+ OAS/OH-6 Oasis case humidifier with magnetic clip and syringe OAS/OH-14 Oasis case humidifier Plus+ OAS/OH-26 Oasis shallow case humidifier with magnetic clip and syringe OAS/OH-18 Oasis ukulele soundhole humidifier OAS/OH-32 Oasis ukulele Plus+ soundhole humidifier OAS/OH-4 Oasis Humigel replacement kit OAS/OH-4+ Oasis Humigel bulk refill kit (sufficient for 20 refills) OAS/OH-R Oasis re-hydrator - not for retail sale - OAS/OH-2 Oasis digital hygrometer OH-2+ OAS/OH-20 Oasis digital hygrometer holder for guitars OAS/OH-30 Oasis digital hygrometer/humidifier combo soundhole mounted 18AHG Martin SPA tube humidifier OAS/OH-21 Oasis double bass humidifier set