The measurement of the angle of the V-shaped iron is generally carried out on a flat plate using a mass, a knife edge, a round bar, etc. This method has low measurement accuracy and is difficult to grasp. We use round bar measurement on the vertical length measuring instrument to improve measurement accuracy and speed. The specific method is shown in the figure. (1) First install the flat probe on the mounting shaft of the instrument and fasten it with the fastening screws. Then manipulate the instrument to make the probe and instrument
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