This standard method describes the steps for linear dimensional measurement using a precision steel ruler. It is suitable for the measurement of linear dimensions of Soft Encasement and Encasement materials, especially if the size is not less than 3mm. Accurate measurement is essential to meet specification requirements and characterize process performance. During testing, it is necessary to ensure that errors are within allowable limits, especially for accuracy and repeatability. The method does not cover specific acceptability criteria, which need to be determined by both the user and the manufacturer. Test results are presented in SI units or inch-pound units, and the values of each system should be used independently to ensure compliance with the standard.