（四）镜片厚度可用镜片厚度卡钳（thickness caliper）来测量。将镜片置于卡爪J之间，指针P将在圆弧刻面上移动一定距离d，即指示所测镜片的厚度，刻度可精确到0。
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Caliper board for aluminum, general 12 mm thickness is usually to 15 mm.
测径板一般为铝制，厚度通常为12毫米至15毫米。
This article mainly introduces the method that adopts gear caliper to measure the median diameter normal tooth thickness of double-line trapezoidal thread.
本文主要介绍了采用齿轮卡尺测量双线梯形螺纹中径法向齿厚的方法，同时也测量出螺距产生的误差。
The Tooth Length, Crown Length, Root Length, Cervix Width, Cervix Thickness, Crown Width and Crown Thickness were measured with a vernier caliper.
用游标卡尺分别测量牙长、冠长、根长、颈宽、颈厚、冠宽和冠厚；
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