She hadn't even known what an extensometer was two months ago. Now she knew it was a device that clamped onto a metal sample to measure tiny stretches as you pulled it apart. And she knew, with a sinking certainty, that her entire dataset was garbage because she’d used Class C grips on a test requiring Class B-2 precision.
It applies to instruments that indicate or record values proportional to length changes—specifically, extensometers measuring tensile or compressive strain. astm e83 pdf
The entire system used to measure elongation, including the sensor, cables, signal conditioners, and digital readout. She hadn't even known what an extensometer was