I have one OASIS uke humidifier hanging in the sound hole of my uke. The OASIS hygrometer is placed in the end of the hard Collings case near the headstock. It is now reading around 38-40% humidity. The humidity in the house is about 30%. (Outside humidity is in the 15-20% range.) I would like to keep the humidity in the case in the 45-55% range. I think the distance between the sound hole humidifier and the hygrometer may be a factor- the humidity in the sound hole is likely higher than the reading. Any suggestions, comments?