LED LIGHT: The LED light can be used in low-light conditions or environments with insufficient sunlight. It functions as a UV light for detecting security features on paper currency, passports, credit cards, traveler's checks, and similar items. SCOPE OF USE: This jewelry loupe can be used for currency inspection, watch repair, fine print reading, photographic analysis, coin and stamp collecting, and other detailed work. PREMIUM MATERIAL: The magnifying glass features a built-in LED light with an on/off switch (requires LR1130 batteries, not included). Constructed with a full metal design for durability, and includes a plastic travel case for added protection. BEST CHOICE: The pocket-sized loupe has a foldable design for portability, making it ideal for use in the field, classroom, or laboratory. This 40X 25mm magnifier is a perfect gift for kids to explore the microscopic world. Note: All dimensions are measured manually. Please allow a 1–3 cm measurement deviation. Due to differences in lighting and display settings, slight color variations may occur. The actual item received may vary slightly in color from the image shown.