An extensometer structure (12) includes a first extension arm (34) having a first mount (44) configured to support a first specimen engaging member (58) and a second extension arm (36) having a second mount (46) configured to support a second specimen engaging member (58). A connecting member (76, 76') extends between the first and second extension arms (34, 36) and pivotally connects to each of the first and second extension arms (34,36) between each corresponding mount (44, 46)and a remote end of the extension arm (34, 36). A rear coupling assembly connects remote ends of the extension arms (34,36) together.