A 10x-20x Dual Sided magnifying loupe for examining pen parts and nibs. The lenses are 10x18mm and 20x12mm in size. The sturdy metal construction allows you to use just your fore finger to hold it, which allows for more natural hand position. Excellent optics allow for a close examination of everything from scratches and cracks to nibs. When done, simply fold the loupe back inside the housing to protect the lens. Comes with plastic carry case.