IT may reasonably be said that the extensometer was, until a comparatively short time ago, employed chiefly in the laboratory. Such extensometers as were used in commercial testing were either of a complicated design, and for that reason were slow in operation, or were not sufficiently sensitive, and in any case were not suitable for the testing of strip.
Skerry, E. (1933), "Extensometers for Strip Steel: Some Critical Notes, with a Description of a New Instrument on Novel Principles", Aircraft Engineering and Aerospace Technology, Vol. 5 No. 10, pp. 239-240. https://doi.org/10.1108/eb029727
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