For cleaning
work I use a desk top illuminated magnifying
glass, I'm not sure about the exact magnification but they seem pretty
standard.. It has a 90mm lens, with an insert for finer
work, the magnification is only about x3 and perhaps x10 in the inset, but I find it perfectly comfortable for all but the finest
work, which I perform with my 20x loupe... I like that the lens is big enough for me to see the coin in 3D without having to splash out on a binocular microscope, ( they can be found for £30/$50 ) and perfectly satisfactory for my needs..
Lee.