Its working ok, I use this link to watch humidity in general. Noting that I am in a good area, and have good humidity most of the year. Basicly you want light green or orange. I use it to see when things are going to get bad, so the wood goes in the bag.
http://merv.metr.ou.edu/weather/run12z/zz_usa_rhum.htmlYou can look up desicant on ebay, There is a guy who sells like 6 for 20.00 thats the best buy. You need more than 2
You still have to have decent humidity to work though, like 55-60 max, glue up, put in bag 3- 4 hours later, and monitor humidity. give it overnight to adjust, up to 8 hours. This is the worst time of year, aug through oct.
I would also store my wood I have in the garage starting in August next year...

I didnt see much over 65% though...
4 mil poly drop cloths, duct tape, desicant, hyrometer (s).
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Here is what a Parlor Guitar is for!
http://www.youtube.com/watch?v=oEa8PkjO6_I