Tran Xuan Dat, Tong Cong Dung*, Le Xuan Dung, Tran Nam Anh, Vu Khanh Phan, Nguyen Xuan Thai and Nguyen Ngoc Danh 2026. Research and design of a calibration and verification system for tape measures and rulers with a measurement range of up to 30 metres. Version B of Vietnam Journal of Science and Technology. 68, 2 (Feb. 2026). DOI:https://doi.org/10.31276/VJST.2025.3449.