人们在生产实践中,经常应用各种光学仪器,进行尺寸测量。在尺寸测量中,人们喜欢精巧方便的仪器,(各种各样的线值计量仪器、角度计量仪器以及投影仪器都早已为人们所熟悉,并得到广泛应用。本篇介绍一种简易测量装置,其结构简单,使用方便,现将它的原理、用途以及在生产实践中像机调焦环在室内外定标的优点简要叙述如下,推荐给有关同志酌情使用。 People in the production practice, often use a variety of optical instruments for size measurement. In size measurement, people like sophisticated and convenient instruments (a wide range of line measurement instruments, angle measurement instruments and projection instruments are already familiar and widely used.This article introduces a simple measurement device, Its structure is simple, easy to use, now its principle, purpose, and in the production of the camera focus ring in the indoor and outdoor calibration advantages briefly described below, recommended to the comrades appropriate use.