Eye Weight: 0.001 mm (0.001 mm) Measuring Range: 0 - 1 Measuring Depth: 0.08 inches (20 mm) Indicated Error (μm) Diameter: 5 mm (0.001 mm) This is a thickness gauge with 0.0000000000000 mm (0.01 mm). A measuring instrument suitable for measuring the thickness of precision accessory parts, film, special fibers, etc. There are two types of measuring range: 0-1 mm, 0-5 mm.