Neurological Hammer. Quality neurological hammer with brush in handle and needle in head of hammer. Has a solid chrome steel handle to hold rubber heads. 8″ long. Contains latex in rubber tips.* This product contains natural rubber latex which may cause allergic reactions .A reflex hammer is a medical instrument used by practitioners to test deep tendon reflexes. Testing for reflexes is an important part of the neurological physical examination in order to detect abnormalities in the central or peripheral nervous system. Reflex hammers can also be used for chest percussion.