Hatori 2pc LED Pen Light Flashlight Warm White with Pupil Gauge Reusable for Students Nurses, Red and Green Light weight and reusable Aluminum material Battery Operated By 2xAAA, included Multi-functional(Pupil Diagnostic, Oral Diagnostic, Throat Diagnostic, Ear Diagnostic) Printed with scales of circle for pupil and a metric ruler from 0 to 5cm