1 According to whether the measured parameter is directly measured, it can be divided into direct measurement and indirect measurement.
2 According to whether the reading value of the measuring instrument directly represents the value of the measured size, it can be divided into absolute measurement and relative measurement.
3 According to whether the measured surface is in contact with the measuring head of the measuring instrument, it is divided into contact measurement and non-contact measurement.
4 According to the number of parameters measured at one time, it is divided into single measurement and comprehensive measurement.
5 According to the role of measurement in the processing process, it is divided into active measurement and passive measurement.
6 According to the state of the measured part during the measurement process, it is divided into static measurement and dynamic measurement.