Handheld magnifying glasses are usually made of plastic or metal materials, with a simple and elegant shell design that conforms to ergonomic principles and provides a comfortable grip. Its lenses are mostly circular or elliptical, with a smooth and transparent surface and excellent magnification effect. At the same time, the handheld magnifying glass is also equipped with a foldable or retractable bracket, making it convenient for users to adjust the viewing angle and height according to their needs.

Magnifier, also known as convex lens, its amplification function is based on the principle of light refraction. When light passes through a convex lens from air, refraction occurs, causing the light to focus towards the center of the convex lens. Therefore, when we place an object within the focal length of the magnifying glass, the light emitted by the object is refracted by the convex lens, forming a magnified virtual image on the other side of the magnifying glass. This is the basic principle that magnifying glasses can magnify objects.