You just need a good hygrometer so you know if the place you keep your guitars is in a healthy range or not. Get one made by an actual industrial instrument company... something that a chemist or pastry chef or artist or woodworker or orchid grower or mushroom cultivator would rely upon rather than something with a lot of brass and wood made to be sold in one of those upscale bauble-shops that sell "Cosby Sweaters" and bottles of "Bay Rum Spice" cologne. Get an Extech or Taylor or Hygroset or something like that. They're cheap - $20/$50. Oh, and calibrate them. You need to calibrate them every year & it's not hard. A well calibrated cheapie industrial hygrometer is better than the best hygrometer in the world if it hasn't been calibrated in a long time. Read up on salt solution calibration or - if that sounds daunting - there are a few companies who have made hygrometer calibration dead simple by selling pre-made salt calibration packs for about $5.
Matter of fact, here you go. This is as simple as it gets - a decent cheap digital hygrometer and the guy throws in your first calibration kit and the whole thing is under 30 bucks.
I was just about to make this same post! I keep a humdifier in my guitar, but live in Denver and am finding it is not enough. My guitar sounded like tinny butt with absolutely no body last night at a gig. Doing some extra humidification and even overnight the body is starting to return to the sound.
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Matter of fact, here you go. This is as simple as it gets - a decent cheap digital hygrometer and the guy throws in your first calibration kit and the whole thing is under 30 bucks.
http://www.amazon.com/gp/product/B002QX ... acleint-20