A tool for neurological and diagnostic testing comprises the combination of a stethoscope with a reflex hammer. When mounted on the stethoscope head the reflex hammer extends beyond the head, without interfering with the normal use of the stethoscope. A handle, which may or may not be joined to the reflex hammer, is positioned on the flexible stethoscope tubing and provides a gripping surface for using the tool for neurological testing. One embodiment has an opening between the reflex hammer body and the handle enabling the user to grasp and rotate the stethoscope head. The reflex hammer, which can be made from one or more members, is adaptable for use with binaural and electronic stethoscopes. A detent on the handle provides an ergonomic grip, or a place for inclusion of indicia.