I bought a Xikar calibrateable hygrometer. It says to put the hygrometer in a ziplock with a lid and wet salt in a lid, but not wet enough to have water standing in it. It said to leave for 4-8 hours and then hit calibrate while inside the baggie. Well, after I did that I went to the ER and ended up hospitalized for 3 days. So it stayed in there for 3 days. When I hit calibrate it said 70% instead of 75%. shouldn't it say 75%? Did I leave it in there too long? I realized my hygrometer wasn't working because no matter where it is its stuck on 40%, so I got this one. What do you think?