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"Back in the old days" when I had a regular job in the photo industry at a professional photo lab we had lots of processors. All of them had chemicals that had to be at a precise temperature, + or - a 1/4 of a degree. That was checked 100% of the time before processing film. We had a accurate temperature control unit, and a temperature probe in the tank. When the probes act up they have to be tested. The company only had a cheap Radio Shack analog meter that was just not accurate. I often had to go home and get my Fluke to test it and determine if the probe was good or junk.
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Glen
49 Year member of the Porsche Club of America
1985 911 Carrera; 2017 Macan
1986 El Camino with Fuel Injected 350 Crate Engine
My Motto: I will never be too old to have a happy childhood!
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