It's unique throwing axe shape Hammer. It is used to detemine if any nuerological disorder.
Berliner Percussion Hammer is easily recognized by it's unique throwing axe shape. Similar to other reflex hammers, the head of this instrument is non-latex rubber used to produce reflexive responses to a striking motion on specific areas of the body. The degree of responsiveness is used to detemine if any nuerological disorder potentially exists.