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Old 02-10-2010, 09:27 PM   #11
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You are never going to get an exact reading, but I always trust glass therms., stems, and Ranco/Aqualogic controllers. Anything electronic could potentially shift in calibration just as a glass therm. could vary depending on positioning within a tank or sump. Cmor has the right approach in having digitals checked for proper calibration if you are concerned.

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Old 02-11-2010, 07:31 PM   #12
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Well James, that's my problem. The mercury says the tank is 79, the Ranco and stem say it is 81/81.8 respectively.
I'm bringing them into work next week. I spoke with a friend in QC and metrology should be able to test and calibrate them for me. Just hope we don't have an FDA inspection that day <g>.

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