ITEM NAME:30X Optical Glass Lens 6LED Full Metal Folding Linen Tester Loupe Magnifier #gib Store Home Promotion Hot Item Add to Fav.Product multiplying rate: 30X standard. Then move the hand-held magnifier back and forth between the object and the human eye until the image is large and clear. If a convex lens is placed in front of the eyes, this problem can be solved.
