Carson LinenTest™ 5x30mm Thread Counting Loupe Magnifiers LT-30, is a compact, fold-out linen test magnifier featuring a 5x power 30mm lens. The LT-30 contains markings in both inches and centimeters for easy measuring of small parts. The LinenTest™ is perfect for stitch counting. This Magnifier is portable, lightweight and folds flat for storing when not in use.