Product Description The complete set is great for rock collectors, coin collectors, hobbyists, jewelers and anyone else who requires distortion free magnification. The 10x power loupe has a focal distance of 1 in. (26mm) with 21mm dia lens size. The 30x power loupe has a focal distance of 1/2 in. (13mm) with 21mm dia lens size. The dual loupe is 10x power with 18mm lens size and 20x power with 12mm lens size, the strong magnifications with a mid distance of 1/2 in..
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