HVML-3.5 Replacement Lens for Binocular Headband Magnifiers, crafted with prismatic glass and offering a magnification of 3.5x with a 4" focal length/working distance. Specifically designed for compatibility with our HVM-3 and HVM-4 models, these replacement lenses also fit many other headband magnifiers, including OptiVISOR® Brand. These replacement lenses are easy to install, requiring a simple process of pushing out the mounting pins or lens screws, installing the new lens plate, and pushing in the mounting pins to securely lock in the new lens. Upgrade your binocular headband magnifier with the HVML-3.5 Replacement Lens to ensure clear and precise magnification for your tasks and projects.