The stylus is a part of the measurement system that comes into contact with the workpiece being measured, causing displacement of the measuring head mechanism. The measurement results are obtained by processing the generated signals. The appearance characteristics of the measured workpiece will determine the type and size of the stylus. In all cases, stylus stiffness and sphericity is crucial. In principle, the stylus is a coordinate measuring machine. "Cutting tools" are like the relationship between turning tools and lathes, milling cutters and boring cutters and milling machines. When measuring with a contact measuring probe, the machine tool uses a stylus to collect data points on the surface of the workpiece. The points generated by each trigger are defined using the X, YZ coordinate values. Then calculate the features, size, shape, and position through these points. The difference is that the scanning measurement head collects continuous data points along the surface of the workpiece. Powerful software utilizes this data to calculate the size, position, and shape of features on the workpiece.