I've had very good luck with the rectangular cheap digitals listed above. For 10+ shipping, I won some awhile back, already had one I got when I got my 1st humidor in Dec. 11.
Aside from changing the battery, and calibrating each once, one of 'em maybe another time, but it was only off 2%. Yes, with nothing but time, and a mad scientist by nature, I'm checking them every so often.
I have excess beads in the humidor and all 3 coolers, and a good number of boxes and cedar sheets in the coolers. Enough that the RH never varies more than 2%, normally between 65 and 67, every so often they may get up to 68, when it is real rainy here.
The cheap analog that came with the humidor NEVER held up for more than a few days! Not even sure where it is.
Numismaniac wrote: