Pen Light, Nurse Penlight LED Medical Pen Light with Pupil Gauge Measurements White Light Gold Green penlight for doctors and the pupil gauge which is helpful in the field and colors will be good for work very bright checking pupils and inside mouth and Works well for best penlight and is attractive for diagnostic penlight reusable penlight is light weight and works well,stethoscope penlight has markings to help with size. the Pupil Gauge is the best healthcare penlight includes penlight pupil gauge,delivers proper lighting Included replaceable AAA batteries, Penlight sise: 13.5cm (5.3")Length x 1.3cm(0.51")diameter, LED color: white light and pen color: yellow or green.