Set Of 5 Round Eye Loupes Tattoo Machine Supplies Flash 3 Eye Loupes. This is a new set of 3 eye loupes. These have quality lenses for extra sharpness and clarity. They are perfect for examining stamps, coins, circuit boards, etc. You receive: One 10X eye loupe with a focal distance of 1" (25 mm). One 5X eye loupe with a focal distance of 2" (51 mm). One 2.5X eye loupe with a focal distance of 3" (76 mm) 3X Loupe. This is a new 3X loupe. Great for viewing stamps, coins, beads and gems. May help reduce eye strain. It has a 3" (76 mm) focal distance 7X Loupe. This is a new 7X loupe. Great for jewelers and viewing stamps, coins, beads and gems. It has a focal distance of 1 1/2" (38 mm).