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用外径千分尺测量，有两种方法。一种是旋动微分螺杆使测量面与被测物接触后，在测量力的作用下，使微分螺杆牙廊的右侧与螺母牙廊左侧接触后读取测得值。二是旋动微分螺杆使微分筒刻度预先指示所需尺寸值上，类似卡板进行测量。上述二种方法前一种方法是正确的。 外径千分尺是
Measuring with an outside micrometer, there are two ways. One is to rotate the differential screw so that the measuring surface is in contact with the measured object and the measured value is read by contacting the right side of the differential threaded shaft with the left side of the dental corridor under the action of the measuring force. The second is to rotate the differential screw so that the differential cylinder graduation indicates the required dimension value in advance, which is similar to the measurement of the pallets. The first two methods above method is correct. Micrometer outside diameter is