Working on the Old Jubilation. Dropped my Fermentap thermometer on the concrete. . . the one I use for the mash tun. Figured I better check its calibaration.
10 degrees LOW!! :o
Anybody know if there’s a way to recal the thing?
Is there a little screw on the back?
You can calibrate it with another calibrated thermometer, or put it in a glass of ice in the fridge and wait for the ice to melt - should be 32F. Or calibrate it to a regular fever thermometer at 97.6F.
Negative on the adjustment screw on the back. I looked for that immediately, but when none was found, I hoped there might be another trick.
Oh . .and I did the ice water thing . .that’s how I found it to be 10 degrees low! 
Not even a tiny Allen screw?
I’ve seen some where you can rotate the dial by holding the stem (probe). Some even have a hex nut at the top of the probe that will help you hold it.
Yep . . hex nut held with adjustable wrench, dial face twisted . . I’m back is business!
Thanks
Sweet!
You’re welcome. Glad it worked out for you.