I have never had luck with digital hygrometers up here in Alaska. I use analog ones with synthtic hair (made in Italy) that have been dead on. I recently decided to try out this Xikar digital one, and see how it worked out. I set it at 75% in the salt procedure, and let it sit for 24 hours inside the baggie. I again set the meter at 75%. I took it out, and immediately placed it in humidor after humidor, and get readings anywhere from 50-56%. All of my other hygrometers show the humidity at 65%, including electronic hygrometers. There is no debate that the humidity is 65% in my humidifiers. I even took the Xikar out, and put it back in the salt baggie. I ended up with a reading way below 75%.
Does anyone know what might be going on? Why do they readings always drop below the actual humidity? Even taking it out for an hour seems to drop the future readings forever. The only way i can get an accurate reading it to leave in in the salt baggie for 24 hours and hit the reset button. Once it is removed, it will never show 75% again!