SL 137-2017 in English

This document outlines the procedures for verifying the accuracy and performance of devices used to measure length in mortar and concrete. It provides detailed guidelines on the calibration process, including the required equipment, environmental conditions, and testing methods. The standard ensures that measurements taken using these instruments are reliable and consistent, contributing to the quality control of construction materials. It covers various aspects such as the preparation of test samples, the calibration of reference standards, and the documentation of results. The procedures described are applicable to a range of instruments used in the field of civil engineering and construction. The standard is structured to facilitate implementation by professionals involved in the testing and inspection of construction materials.