Product review (2 stars): Hygrometer not accurate
My Spanish guitar needs to be stored at 40% or higher humidity to keep it from cracking, etc at our dry climate in Colorado. I have had to buy several different hygrometers because the readings vary so much that i could not tell which one was accurate. Finally I purchased a kit that tells you how accurate your hygrometer is (from Amazon) and this ThermaPro was off by 7%. You get what you pay for !