Geometric dimension calculation teaching tools are practical tools for assisting geometric measurement teaching, including rulers with scales, protractors, tape measures, and solid dimension measuring instruments, equipped with spliceable geometric models. In teaching, measure the length, width, and height of the three-dimensional model and derive the volume formula. Through practical operation, enable students to master the conversion of units such as millimeters and centimeters, and understand the logical chain of "measurement calculation". The ability to transform abstract dimensional concepts into concrete operations, enhance the sense of quantity and calculation accuracy, is the core tool for geometry measurement teaching in primary and secondary schools.