The LinenTest magnifiers from Carson are a compact, fold-out thread testing magnifier that comes available in multiple sizes. The LT-30 LinenTest magnifier has a 5x power magnification with a 30mm lens diameter. The LT-20 version of the LinenTest contains a 6.5x power magnification with a 20mm lens diameter. Both versions of the LinenTest magnifiers contain markings in both inches and centimeters for simple measuring of small threads and intricate details. The LinenTest magnifiers are 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 fold flat for easy storing when not in use.