Davidson Optronics Model D-602 Autocollimator

Older Model Autocollimator with Wooden Stand UNTESTED Keuffel & Esser Co. Hilger

Opto-metric Tools Inc, AUTO COLLIMATOR, Ernst Leitz Wetzlar Germany

Davidson Optronics D-639 Trihedral Prism with D-406A Power Pack D406A/D639

Davidson Optronics 8 3/16" Master Optical Flat, Master Grade 0.000002", Wood Box

Warren-Knight precision optical autocollimator / alignment telescope,

Opto-metric Tools Inc, AUTO COLLIMATOR, Ernst Leitz Wetzlar Germany

Keuffel & Esser Co. 182764 Optics and Metrology Sphere, In Case