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Old 05-16-2008, 01:11 PM   #1
Stevorino
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Default NIST Certified Thermometers

I did some searching and found some great threads. But I wanted to verify something I couldn't nail down:

If a Lab Thermometer is NIST Certified-- does that mean it is guaranteed to be and STAY calibrated?

I really want to zone in my thermometers, but before spending $40 on a lab thermo, I want to be sure that it will be reliable into the future.

Thanks guys!

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Old 05-16-2008, 01:40 PM   #2
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I work as Lab Supervisor for a Wastewater Treament Plant. Just because the thermometer is NIST certified does not mean it will hold the calbiration forever. We send our thermometers out ever year for this certification, big bucks. You have paid them to say it calibrated correctly. Buy a good thermometer with a calibration screw and calibrate it in boiling water. (212 degrees)

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Old 05-16-2008, 06:12 PM   #3
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Quote:
Originally Posted by dadawg View Post
I work as Lab Supervisor for a Wastewater Treament Plant. Just because the thermometer is NIST certified does not mean it will hold the calbiration forever. We send our thermometers out ever year for this certification, big bucks. You have paid them to say it calibrated correctly. Buy a good thermometer with a calibration screw and calibrate it in boiling water. (212 degrees)
Can water reach over 212 or will it sit at 212? For instance, if I put it on the stove...do i need to calibrate right at boiling point?
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Old 05-16-2008, 06:43 PM   #4
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Quote:
Originally Posted by Stevorino View Post
Can water reach over 212 or will it sit at 212? For instance, if I put it on the stove...do i need to calibrate right at boiling point?
It will stay at boiling. But you might look up a boiling point adjustment tool, elevation and atmospheric pressure can change the boiling point.

Here is a table: http://www.hi-tm.com/Documents/Calib-boil.html
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