What is the needle and brush used for in the Buck and Babinski neurological hammers?

Our Buck and Babinski neurological hammers are equipped with concealed needles and/or brushes to allow for additional reflex and neurological testing. The brush accessory can be used to assess thigmesthesia or sensitivity to light touch on various parts of the body. The needle can be used for similar testing or to assist in testing for pain sensitivity in the upper or lower extremities. (Important note: neurological hammer needles are not designed to pierce the skin and are not sterile devices.)