Designed for thread counting in fabrics, as well as general purpose use. 6.5x power, 30mm lens, 1" x 1" inside viewing area with 1/8" and 1mm engraved graduations. Constructed of black anodized aluminum with precision ground lens. Perfect for stitch counting, checking fabric quality, examining color separations in print, stamps, currency, line weight in barcodes, etc. These acrylic magnifiers are portable, lightweight and folds flat into a compact size for easy storing when not in use.