B49 Size 320 For Display Cases

Professor

Use the 320s for 4 guitars in a new guitar cabinet. The recommendation is one packet for each instrument. I use 5. Works really well. And the folks at Boveda were so responsive to my questions.

not good

Would not raise humidity above 41%. Measured with a calibrated hygrometer. Airtight cello case' Jeff Selman

Doesn’t come close to reaching 49%

Bought these for two single guitar display cases. When the room hygrometer measures 68% the lowest I can get in the cases is 61%. Not sure why this would be but my expectation was a humidity level closer to 49 or 50%. They've been in the cases for a couple of weeks but still the same results. I have 3 different hygrometers, each reading within a percent so it doesn’t seem to be an issue with the hygrometers themselves.