High-quality Materials: Our Diagnostic Medical Penlight made of medical grade aluminum alloy safe and environmentally friendlywhich make this penlight Long-life Ensure that there is no harm to sensitive skin and physical examination easy to use and affordable Easy To Use & Portable: Our reusable LED nurse pen light is a single-click button that can be clicked and turned off Light weight stylish appearance with metal clip easy to carry and use for a long time Power: These medical penlight is Powered by 2 AAA batteries (not included batteries) it is reusable by changing batteries Penlight Design: There are pupil gauge and a 5cm-ruler on the side of the penlight It is very helpful for you to measure the pupil dilation and length on using these medical penlights Widely Used: These medical penlight with white light can be used to check nose mouth and ears Not only for medical our pen lights can be used as tactical flashlights for outdoor camping and home electrical maintenance as home use for your kids or pets