Magnifying lamp features a 5-diopter, 4" glass lens that magnifies items by 225 percent to give you an up-close look at your items. The long, adjustable arm provides a 30" reach to easily observe large or small items. Nonreplaceable, 9.4-watt LED creates a bright light to ensure your items are brightly illuminated. Magnifying lamp with a metal clamp is designed to attach to surfaces up to 2-1/2" in thickness.