Nagel Anomaloscope Model 1 (c. 1907) On Display:Nagel Anomaloscope Model 1 Source: Online Auction

Source: Online Auction

photographers had to peek through a normal glass viewfinder and keep an eye on a tiny screen on top to manage their storage

Acquired from: eBay

Source: eBay Auction

and a secondary slot that let users play older Game Boy Advance cartridges

Nagel Anomaloscope Model 1 (c. 1907) On Display:Nagel Anomaloscope Model 1 Source: Online AuctionThe Nagel Anomaloscope Model 1 is considered the absolute "gold standard" medical instrument used by doctors to precisely diagnose and classify red green color blindness. Invented by a German scientist in 1907, the device was developed to provide a rigorous, foolproof scientific evaluation that was far more accurate than simple printed color cards. When a person looks into the viewing eyepiece, they see a circular screen split perfectly into two