The NEXIV VMR-C4540 - designed for use with 300mm Front Opening Unified Pod (FOUP) & Front Opening Shipping Box (FOSB) wafer carriers - detects hard to see edges using a variety of illumination features as well as Nikon's unique image processing technologies. By incorporating laser AF that provides quick non-contact focusing, even on transparent surfaces and on the edge of the peripheries of the wafer, the VMR-C4540 is able to measure SEMI-standard dimensions with excellent accuracy.