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Easy, quick, one-handed placement is the key to United's Model EZ Extensometer. Designed with a minimum number of moving parts, and "snap-on" mechanization, the unit combines simple operation with reliable, efficient measuring performance. To accommodate most testing requirements, the EZ extensometer can be used on either round or flat samples. Each comes with two special features: a built-in overload protection and the automatic gage length setting which helps ensure a high degree of consistency between the users and the testing samples. Special gage lengths are also available upon request. Available in both room and high temperature versions, the EZ Extensometer is accurate to ± 0.0001 (Class B1) as per ASTM-E83.