I guarantee it and will fix it if ever needed. This scope came from a university biology lab. Used Cycloptic Series 58M-1, with Mirrored Substage Base. Has Magni-changer M giving 7X, 10X, 15X, 20X, and 25X with 10X eyepieces. Magnifications changed by dial rotation with 10X eyepieces.369 -- 6V 20W tungsten lamp, variable transformer. More light with less heat. I image is clear and the mag changer rotates smoothly. The item "AO Cycloptic, StepMag, Stereo 7X, 10X, 15X, 20X, &25X, 10X eyepiece, & Light Source" is in sale since Friday, October 8, 2021. This item is in the category "Business & Industrial\Healthcare, Lab & Dental\Medical & Lab Equipment, Devices\Microscopes". The seller is "mikroscopes" and is located in Marietta, Georgia. This item can be shipped worldwide.