Enhance your precision and efficiency with the Bergeon 7913 Eyeglass Loupe. Featuring a high-quality biconvex lens with a strength of 3.0 and magnification of 3.3x, this loupe is perfect for professional watchmakers. Its clip allows for easy attachment to glasses, and the screw cap makes lens replacement and cleaning a breeze. Experience the difference in your work with this lightweight and versatile loupe.