Peak Scale Loupe 10X has precision-constructed achromatic lenses (coated 4 elements, 2 groups), a photo-printed scale and focusing ring. Magnification: 10X Field of View: 32 mm (1.24 inch) Scale Length: 30 mm (1.17 inch) Minimum Scale Division: 0.1 mm / 0.005" Eye-piece: 20 mm Size: 46 x 44 mm Net Weight: 74 g Pitch 1mm, Diameter 38mm for base threads. The contradiction between high resolving power and wide visual field has been completely eliminated from this product so it can provide efficient inspection.