在通常情况下内径百分表测量孔的直径时，往往是采用外径千分尺来设定调整内径百分表的“零位”。在这种情况下，同样一只内径百分表，使用不同的外径千分尺来设定调整内径百分表的“零位”，“零位”往往不同，从而造成测量同一孔径的结果也往往不同，有时甚至相差较大。造成 Under normal circumstances, the inner diameter dial indicator hole diameter measurement, it is often the outer diameter micrometer to adjust the dial gauge to adjust the “zero.” In this case, the same internal dial indicator, using a different outer diameter micrometer to adjust the “zero” dial gauge, “zero” is often different, resulting in the same measurement results of the aperture often Different, sometimes even bigger difference. Cause