Pneumatic measuring instruments are devices that measure the length dimension using compressed air as a medium based on hydrostatic and hydrodynamic principles. The utility model has the advantages of wide application, high measurement precision, simple structure and convenient operation, and is particularly suitable for high-precision and large-volume workpiece measurement in the automobile industry. The special advantage of the pneumatic measuring instrument is that non-contact measurement can be achieved. In the measurement work, the measuring head is not in direct contact with the measured surface, which not only reduces the influence of the measuring force on the measurement result, but also avoids the scratch being measured.
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