Purchased two of these hygrometers at same time. Performed salt test on both at same time and one read 3% low and the other 6%. Performed a second salt test with same results. Problem is these hygrometers cannot be calibrated. Also, material that came with them state they are accurate to +/- 5%. Had description stated this I would not have ordered in first place - a range of 10% is not adequated to take care of your cigars. On the positive side I like the look and size, and they do a great job measuring temperature, but accurate hygrometers they're not. Would not purchase again.
GL in July 17, 2012