I've seen those ones Jesse Joe and I'm sure they do the job as the guy says.
The ones I have are made with plastic with a special sponge inside and they sit between the strings in the hole of the guitar. They take distilled water only and I try and follow the instructions best as I can.
They'll probably have to be replaced soon as I'm sure the sponge will eventually decay.
Wish I knew how to put up a pic but too much of an old school guy I guess.
This is very interesting Jesse Joe and thank you for sharing.
The article by Carson Bailey has piqued my interest especially when he writes about the importance of getting humidity to the neck of the guitar.
The Planet Wave is the one that I have been using and it seems to be working well (no cracks) but I certainly intend to look at the SKB model now with that additional information regarding the neck of the guitar.
Next time I visit Toronto I'll stop by Ring Music and ask John Laroque for his recommendation as well. He services Gord's guitars.
The Vancouver climate isn't quite as dry as the central part of the country so that's probably a saving factor.
I use a Planet Wave in the OM28V. In the D15, I use a film container with holes punched in the lid, with a damp sponge inside. It looks a lot like the Herco humidifier. The Planet
Wave is nice. I just use regular water in it, though.