The HTM7 Gear Tooth Form Apparatus is teaching equipment designed for the demonstration of basic gear theory. It helps teachers to show and describe how gear teeth are defined and how basic gears work by carrying out experiments on the equipment. The equipment enables the students to practically understand and determine the shape and construction of an involute curve. It consists of both large and custom-made gear for describing how gears mesh together and the practical analysis of the gear form. In addition, there are labels used on the equipment to help clearly explain gear theory.