The optimeter is widely used to precisely measure external size ofworkpiece by comparison with a gauge block or standard part.

本仪器是一种采或标准零件与试件相比较的方式测外形尺寸的仪器。

The optimeter is widely used to precisely measure external size of workpiece by comparison with a gauge block or standard part.

本仪器是一般是标准器（如）以比较法测工件的尺寸。