I'm interested in this thread too. I have a beautiful old stainless and glass Kodak process thermometer but I would rather use that as a standard to calibrate other, more rugged, less precious ones. I would be very interested in any suggestions for an accurate, easy to read, preferably inexpensive one that can be calibrated. I am only processing B&W now so I'm looking for something that covers the 70ºF range.
I have a Weston but it doesn't have a calibration nut behind the dial. It is old. Do the newer Westons have this adjusment? I once had a Beselar dial with this feature but it is long gone.