This innovative pen light is specially designed for medical professionals such as doctors, dentists, and students to aid in pupil examination and measurement. The LED light is bright and long-lasting, ensuring accurate readings in emergency situations or during routine examinations. This pen light is durable and reliable. Ideal for use in pediatrics, emergency medicine, dental laboratories, dentistry, family medicine, and other healthcare settings, this pen light is a must-have tool for any medical professional. It features a pupil gauge and ruler for precise measurements and is easy to use, making it the perfect addition to any medical kit.