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She looked at the extensometer on her desk. The dented one. Its last verification certificate, if it ever had one, was gone.

: Testing extensometers against recognized displacement standards to calculate absolute and relative error. astm e83 pdf

: Based on the results of verification, systems are assigned classes (e.g., A, B-1, B-2, C) that define their performance limits. For instance, a Class B-1 classification requires an error of strain not to exceed the greater of of the value. She looked at the extensometer on her desk