I have a pair of them and they're off a collective 16 points. I threw one away that was off 13 points. The cool thing about them is that they changed every time I tested them. I just saw them the other night in the bottom of a box. That's where they've lived for a long time now.
I figure if I'm gonna spend thousands on the best cigars I can find, I can spill the extra 15 bucks for a good, calibratable hygrometer/thermometer.
Notice that I tried to cheap out three times before I learned my lesson.
