Astm E83 Pdf ((exclusive)) Page

It applies to instruments used for both tensile and compressive strain, using either SI or US customary units. Exclusions:

The standard requires the test to be conducted within a specific temperature range (usually 20°C ± 2°C or similar) because thermal expansion can affect the calibration of both the extensometer and the reference standard. astm e83 pdf

If you work internationally, you will notice that the has a cousin: ISO 9513 . It applies to instruments used for both tensile

: Assigning a specific performance grade (e.g., Class A, B-1, B-2, C, D, E) based on the maximum allowable error. astm e83 pdf