Max Vision Loupes are available as a frame mounted system or as a clip on system.Both are available in 2.5X and 3.5X, feature coated optics with an adjustable PD knob and offer a working distance between 14 and 17 inches. Both systems flip up and hold securely with coated clips. The frame mounted system measures 55 mm by 17mm with a 140-mm temple and flexible spring hinges. A safety lens is included and prescription can be accommodated. Max Vision Loupes come with a one year warranty, headstrap, screwdriver, temple extensions, a soft cleaning cloth and a free bottle of Clear Vision Optical Cleaner/Sanitizer.