Yes I probably bought the same ones years ago. Wrapped in sealed bags. I just tried using one in my bathroom. They are not reliable near the extremes. You cannot set it to 80 % hummidity. The horse hair mechanism is too critical up there. I was able to set it to about 60%, and one rainy day it just came on. i mounted it uo in the air box which I had taken out the fan and used an in-line fan for noise control.Its works OK with the Dew Stop condensation sensor, but I really need more CFM. Most mechanical sensors have the wrong connection for fan use.
greg