On'h Nurse Penlight LED Medical Pen Light with Pupil Gauge Measurements (Gold+Green, Warm Light) Better visualization of colors when assessing body tissues. (e.g. throat, eyes, etc.)Doctors and nurses have to keep track of so much stuff that they are often looking through drawers, cabinets and closets to find what they need. Having a small flashlight handy is important for these small tasks. Click nurse penlight holds, extra bright sealed concentric beam. Dual-function pocket clip for portability and for activating the nursing penlight Not harmful when used repeatedly in the eye,Battery life longer,Bulb won't break unless you hammer it. Included replaceable AAA batteries, Penlight sise: 13.5cm (5.3")Length x 1.3cm(0.51")diameter, LED color: warm white and pen color: yellow or green.