A new extensometer for electromechanical testing instruments is designed to measure strain to rupture in highly extensible materials. The Extra Long Travel Extensometer (EXL) from Instron Corp., Norwood, Mass., clamps directly onto a specimen and measures elongations up to 30 in. of clamp displacement and 3000% strain with a 1-in. gauge length The unit adjusts to incremental gauge lengths (English or metric) from 0.5 in. to 5 in. (10 to 200 mm).
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