Name: linen tester, folder magnifier.
1. Linen tester with fixed focus 6x magnification. 2. Size: 30 mm. 3. Lens: optical glasses. 4. Frame: metal. 5. Folding magnifier with a photographic-quality glass lens. 6. The base is clearly marked with engraved, white lines and numbers in both inches and millimeters. 7. Packing: each piece in a PVC bag, PU pouch or velvet pouch.