I received mine in excellent condition - there were no scratches on the glass as one reviewer noted. The size of a 10x magnifier is advertised as 18mm, but the glass is 15mm or just under 5/8 inch. The size of the 20x magnifier is smaller (for viewing small objects) and actually slightly larger than the advertised diameter of 12mm or about 1/2 inch. This size is more than sufficient to consider diamonds, for example, but it may not be sufficient for geological purposes. I have no complaints about the optical quality. The mechanical build quality is more than I expected for the price. If you need a large and powerful loupe with a built-in LED light, even with a spare battery, consider the SE 30X Illuminated Jewelers loupe. It has a plastic body for the lens, but the illuminator works well and the diameter of the optics is 7/8 inch or about 22mm, which is more than twice the area of the larger magnifier on this model. The price is a whopping $4.15. Admit it, these things are practically free if you choose the free shipping option. And you can look this gift horse in the mouth and go home with a smile. Tim
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