Last night my hygrometer said 68%. I examined my Taylor, and the front and back had swollen like the pics you see on the internet with the caption- don't let your guitar do this! I checked out my Collings acoustic, (which I keep in the case with it's own hygrometer) it was fine. My heart rate returned to normal. I moved them both to my basement (60% believe it or not) and tuned up my dehumidifier as high as it would go. This morning my Taylor was fine. Thank God. I'm going to buy small hygrometers for my hollow and solid body electric guitars, but I'm having trouble finding small ACCURATE hygrometers. I'm looking for a small hygrometer to fit in my guitar case. It seems most are +/- 5% of so. This seems a little inaccurate to me. Can anyone recommend a hygrometer? (Radio Shack doesn't have anything) What is the most accurate hygrometer you've found? How often have re-calibrated your hygrometer? What else do you know about hygrometer?