The AC453 Digital Autocollimator is a high performance 2-axis non-contact digital angular displacement sensors. This new series of digital autocollimators replace the field proven AC416 autocollimators previously offered. Like the AC416 this new generation of autocollimators were specifically developed for companies that produce instrumentation or tooling requiring high precision alignment. The autocollimator also provides a means to inspect and characterize material and components. The package is comprised of a sensor module and with integrated electronics for direct readout from a PC or handheld unit. One of the very unique and useful characteristics of the AC400 Series Autocollimators is the very small beam size. The typical 3mm beam diameter means that the reflecting sample surface needs to be only slightly larger.