This article provides a detailed, standards-driven guide to gauge length selection for video extensometers, with practical examples from ASTM D638, ASTM D412, ASTM E8, and ASTM D3039.

Whether performing routine tensile testing, measuring Poisson’s ratio, or conducting full-field strain analysis, correct sample marking is essential for reliable, repeatable strain data. This article provides a comprehensive guide to sample marking for video extensometers, explains how digital image correlation (DIC) works, and outlines best practices for achieving high-quality strain measurements across a wide range of materials.

Learn when to use an extensometer and why it is important for tensile testing on a universal testing machine.