Specifications: ❀ Magnification: 10X ❀ Field of View: 25mm (0.98") ❀ Scale Chart: 20mm (0.79") ❀ Length: 30mm (1.18") ❀ Min. Scale Division: 0.1mm ❀ Light Source: 8 LED ❀ Power Supply : 4 AG9 Button Battery (Installed) Features: ❀ 8 different glass reticle scales for other measuring and viewing purposes. ❀ Adjustable height (focal length) from 51mm to 63mm according to your different requirements.10X magnification, perfect for observing details clearly. ❀ High quality triplet optical glass coating lenses. anti-scratch lens coating for long durability. with soft artificial leather case which is perfect for loupe storage. ❀ Used: close work: coin collection supplies (as coin magnifier with light), stamp collecting, jewelry making and repair, diamond, jewel gem, gold testing etc. Package includes: 1 x Jewelry Magnifier 1 x Leather Case 4 x AG9 Button Battery Notes: 1. Size for manual measurement, there may be a 1 to 3 mm error, belongs to the normal phenomenon. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!