Created mostly for compressive strength checks on rock, concrete and various large compression samples, this design measures axial strain on reverse sides on the take a look at specimen, along with the output is a mean of the two readings. Gauge Lengths: 25 – two hundred mm Watch Calibration References https://pcidsscompliancecertification.com/blog/why-iso-19770-certification-is-a-must-for-saudi-arabian-it-departments/