This set includes three durable aluminum alloy penlights, each measuring 0.47 inches in diameter and 5.5 inches in length, weighing approximately 20 grams. Designed for medical professionals, these penlights feature a built-in pupil gauge and a 5cm ruler, aiding in accurate assessment of pupil dilation and body measurements. Each penlight is powered by two AAA batteries, with six batteries included in the package. The penlights are easy to operate with a push-button switch and come with a pocket clip for convenient carrying. Made from high-quality materials, they are built for durability and long-lasting use. Suitable for nurses, doctors, EMTs, and trauma care, these penlights are essential tools for medical examinations and assessments. All items are hand-assembled, inspected, and tested to ensure quality. Compact and lightweight, they are designed to be easily stored and readily accessible during medical procedures.