In use, measuring tools and measuring instruments can be divided into the following categories:
    1Reference measuring tool and measuring instrument
    Measuring tools: measuring block, polyhedral edge, line grain scale, etc.
    Measuring instrument: laser light wave comparator, light wave interference comparator, vertical optical meter, etc.
    2Universal measuring tools and measuring instruments
    Measuring tools: cast iron plate, cast iron, inspection plate, marking plate, riveted plate, assembly plate, marble plate, caliper, steel ruler, vernier caliper, depth ruler, etc.

    Measuring instrument: dial indicator, dial indicator, lever dial indicator, micrometer, length meter, light comparator, etc.

    Measuring instrument according to its working principle can also be divided into:
    (1Mechanical measuring instrument:A measuring instrument that uses a lever, gear, spring, etc. as a transmission amplifier and is expressed through a reading device.
    (2) Optical measuring instrument:A measuring instrument made of optical lever amplification using the principle of light reflection.
    (3) Gas momentum meter:A measuring instrument based on the principle of changes in pressure or air flow when compressed air flows over the surface of a part.
    (4) Electric momentum meter:A measuring instrument that converts changes in length size into changes in electrical quantity such as inductance and capacitance.
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