The HD400 is a dual lens optical comparator offering a two-lens mount allowing instant switching between two magnifications lenses. The HD400 is equipped with a 16" (400mm) travel workstage as standard. Optional automatic optical edge detection removes operator subjectivity in locating edges of parts being measured. A bayonet style lens mounting system accepts a choice of five interchangeable lenses. Motorized stage and swing-away lamp house are optional features.