Measuring instruments can be divided into four categories according to the structural characteristics of measuring tools, gauges, measuring instruments and measuring devices.
    1. Measuring tool
    Measuring instruments refer to measuring instruments that reproduce the measuring value in a fixed form, and there are two kinds of single-value measuring instruments and multi-value measuring instruments. A single value measuring tool is a measuring tool that reproduces a single value of a geometric quantity, such as a measuring block, a square, etc. Multi-valued measuring tools are those that reproduce a series of different measuring tools within a certain range.
    2.gauge
    A gauge is a special measuring instrument without a scale, which is used to test the comprehensive results of the actual size and form and position errors of the components. The test results can only judge whether the measured geometric quantity is qualified or not, but can not obtain the specific value of the measured geometric quantity. Such as smooth limit gauge, position gauge and thread gauge to check the workpiece.
    3.measurer

    A measuring instrument is a measuring instrument that can convert the measurement value of the measured geometric quantity into the directly observed indicator value (indicating value) or equivalent information. According to the principle of signal conversion, the measuring instrument is divided into mechanical measuring instrument, optical measuring instrument, electric measuring instrument and pneumatic measuring instrument.

    4.Measuring device
    Measuring device refers to the whole set of measuring instruments and auxiliary equipment necessary for determining the value of the measured geometric quantity. It can measure more geometric quantities and more complex parts, which is helpful to realize automatic and semi-automatic detection. Such as connecting rod, rolling bearing parts can be measured by measuring devices.
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