Direct purchase of the latest version (currently E83-23 or newer).
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The standard categorizes extensometers into "Classes" based on their maximum error and repeatability. When you review an ASTM E83 PDF, you will see a table detailing these requirements: Relative Error of Gauge Length Fixed Error (whichever is greater) ±0.00001 in. Class B-1 ±0.0001 in. Class B-2 ±0.0001 in. Class C ±0.001 in.
When searching for an , it is vital to obtain the correct, legal, and most up-to-date version. Standards are revised periodically (e.g., ASTM E83-23, where "23" denotes the year of the last revision). Official Sources
ASTM E83 | Verification and Classification of AVE3 - Instron
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.
ASTM E83 is not intended to be a complete purchase specification. Rather, it provides the technical procedures and error limits for verifying and classifying an extensometer system after it has been manufactured or during its ongoing use in a laboratory.