Mini Medical Penlight with Pupil Gauge for Nurses, Hatori A Pack of 3pcs Aluminum Reusable White LED Pen Flashlight (Black/Silver/Green) GOOD AND WELL-MADE PENLIGHTS: made of great aluminum, powered by 2x AAA batteries(not included) A SET OF THREE: the package consists of three different colors of led penlights DAILY USE AND MEDICAL USE: This flashlight can be used indoor and is designed to be used by ophthalmologists and optometrists for checking nose, ear health MULTI-FUCTIONAL MINI FLASHLIGHT: Printed with scales of circle for pupil and a metric ruler from 0 to 5cm TWO-YEAR WARRANTY: any problems within 2 year will be patiently solved by our after-sale service