The normal AlM autocollimator was divided into four series by the accuracy degree:Laser,Base, EN,Std, Plus,Pro and Ultra. The Laser series use laser source and the othersuse white light. All the four series can be used for optical aligning, precision anglemeasuring, straightness, parallelism, squareness and flatness measuring. All the series have all kinds of focallength design, which can satisfy most of the using. The laser series has a special using field for CCD chip positioning for the laser high power property.