Dial indicator is used by fitted to Jig etc., while thickness gauge is held simply with our hand. After inserting workpiece between the measuring contects, releasing the lever will cause the spindle to contact the workpeice and give an accurate size reading. Contact point moves to upward when lifting lever is pressed down, and Contact point returns to zero" when it is released. As operation is easy,it can measure for a short period compared with micrometer. There are 2 kinds of Dial, 0.01mm, 0.001mm for analog and digital. The stroke depends on size of workpiece and a model is available to measure maximum thickness up to 50mm. This can be used for various thickness measurement such as paper, rubber plate, Metal Tube, smail molded components.