Neurological medical Reflex Hammer:
Hammers specifically suited to test reflexes were soon developed, the first of which had the now classic shape we’re accustomed to — a thin metal handle with a triangular rubber head. Designed by American physician John Madison Taylor in Philadelphia in 1888 — and modified ever since by many — the simple device was heavy enough to elicit reflexes, and had round edges to ease impact.
The Krauss hammer, developed by German-American physician William Christopher Krauss, was designed around the same time. It had two rounded heads: a large one for knees and a smaller one for biceps. Dr. Ernst L.O. Trömner’s did too, but it also tapered to a thin end to assess skin reflexes. There were also the Queen Square hammer, the Babinski hammer, the Buck hammer and the Berliner hammer. The Stookey hammer flaunted a camel hair brush to get a better sense of touch sensation. The list goes on.