采用激光扫描与CCD探测系统的大型工件平行度垂直度测量仪，以稳定的激光束为测量基线，配以回转轴系，旋转五棱镜扫描出互相平行或垂直的基准平面，将其于大型工件的各个面进行比较。在大型工件的安装或测量时，可用本仪器测量面向间的平行度或垂直度。(The stable laser beam is taken as the measuring baseline, and the rotary axis system is rotated together. The five prism is rotated