10X 15X 20X 30X Jewelers Loupe/Loop Magnifying Glass This is a new dual power loupe made of optical glass with a swing-away, chrome plated case This has become the standard style of loupe used in the watch making industry and is excellent for any application where magnification is needed It is 10X power on one end and 20X power on the other The 20X has a 12 mm lens and the 10X has a 18 mm lens The 10X lens has a focal distance of 1" (25 mm) and the 20X lens has a focal distance of 1/2" (13 mm)