Abstract: A stethoscope comprises a pair of binaurals, an acoustical tubing and a chestpiece. There may be a light source within the chestpiece suitable for medical examination purposes. The electrical supply means for operating the light source may comprise one or more batteries. The chestpiece comprises an upper member and a lower member, which may be releasably attached. The chestpiece may have a contoured gripping surface. The light source may have switching means that may be pushed and held to activate the light, and released to deactivate the light, or may be pushed to activate the light, and pushed again to deactivate the light. The acoustical tubing may have measuring indicia that may comprise a pupil dilation measuring scale or a scaled ruler.