Detail 01
Humidifier measures 4" x 1.25" x 3/8"
Slim and narrow, so it fits an accessory compartment or the gap alongside the body without pressing on the instrument.

Independent shopping perspective
The OH-14 case humidifier bundled with the OH-2 digital hygrometer. Buy this if you want to add moisture and actually see what the case humidity is.

Strong match
Consider the trade-offs
What matters in use
Catalog numbers tell only part of the story. These are the details most likely to change how this product feels, sounds, or fits into a setup.
Detail 01
Slim and narrow, so it fits an accessory compartment or the gap alongside the body without pressing on the instrument.
Detail 02
Gives an actual case humidity reading, so you know when to refill instead of guessing on a calendar.
Detail 03
Roughly the humidifier plus a standalone meter. You're paying for the reading, not a better humidifier.
Detail 04
It conditions the whole closed case rather than just the soundhole area, so the neck and sides get the same air.
Detail 05
Humidifying performance is identical to the cheaper listing. The difference is the meter.
Final check
Product questions
Straight answers to the questions shoppers most often ask about this product.
Same humidifier, plus the OH-2 digital hygrometer. If you already own a hygrometer, buy the standalone OH-14 and save the difference.
4 inches long, 1.25 inches wide, and 3/8 inch thick — thin enough to sit in a case compartment.
Most solid-wood acoustics are happy around 45% relative humidity. The hygrometer is there so you can hold that range instead of guessing.
The OH-14 is sized for guitar cases. For a ukulele case, the OH-18 is the correct size.
Reference
The complete catalog record, organized around the decisions musicians make when comparing gear.