Some of you may remember my post about the temp difference I was seeing between my mercury thermometers and my digital ones.
I have a lab grade mercury thermo and a cheap plastic one for a tank. Both of them agree on the temperature of a water sample. I have a controller for my heaters and a digital readout on one of the heaters (separate controller).
Both of the digitals read 2 degrees higher than the mercury based thermometers. So which one is correct?
I work at a pharmaceutical company so I asked our metrology department to test one of each of my thermometers. They have a temperature calibrated incubator with a thermometer inside and a canister of some aqueous solution which is used for calibrating thermometers used in manufacturing.
The results PLEASE!!!!!!!!!!!!!!!!!!!!!!!!!!
Well after a careful test of both my digital hand held and my lab grade mercury thermometers, it turns out that the mercury thermometer agrees to the tenth of a degree with the test equipment. The digital reads 2 degrees higher.
So my tank that never varies from 79 degrees is actually a very stable 77 degrees.