Drive is an endoscopic test instrument used in the dental department to measure the depth of teeth foot in treatment. Combined with modern communication technology, it has powerful functions, including the precision grinding, which features the freedom,intuitiveness and definability andreaches the maximum of flexibility and efficiency. The advanced and extensible functions and service modules are forward-looking. This hand-held product is designed to be comfortable and has an ergonomic model, simple, elegant and reliable. Body of the machine is made up of the high-quality stainless steel. The hand-held cover is made up of aluminum, making it lightweight. The certain sense of weight guarantees the operators precision and reliability. LED lights on the back show its battery status. Doctors can work with only one hand when putting this product into the oral cavity. Just with the help of index fingers, they can operate multi-function capacitance in the oral cavity rapidly with one-click. Other controls can be displayed clear and distinct on the mainframe. The usability engineering design and evaluation of this product are the focuses. According to it, we finally develop the intelligent, humanized and high-quality medical devices.