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See this Paper for An Uncertainty Analysis of Fluke Calibration Fused-Quartz Bourdon Tube Pressure Products from the 2013 NCSL International Workshop and Symposium.

Here is the link to view or download the Paper,

http://us.flukecal.com/literature/articles-and-education/pressure-calibration/papers-articles/uncertainty-analysis-fluke-ca

Covers these models: 
7250
7250LP
7250i
7250xi
7250-SYS
7050
7050LP
7050i
7252
7252i
7750i

Also see this article, QBT Product Specification Changes effective September 2021. 

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Keywords: QBT