On'h Nurse Penlight LED Medical Pen Light with Pupil Gauge Measurements (Blue+Purple, White Light) The LED light is bright and clear and well-suited to quick neuro checks or taking a quick peek at an IV site in a patient room at night hopefully without waking them up.It has a clip that helps you keep it in place.they are made very durable and easy to clean diagnostic reusable LED pen light with pupil gauge and check our kid's ears and any other random need in their bedrooms. doctor penlight for the healthcare penlight with Perfect lighting and easy to hold very durable reusable penlight tactical penlight works great and long battery life and pupil penlight plenty bright for pupil checks Included replaceable AAA batteries, Penlight sise: 13.5cm (5.3")Length x 1.3cm(0.51")diameter, LED color: white light and pen color: blue or purple.