Features: Solid Material: Crafted from high-quality ABS plastic, this magnifying glass is robust and durable, not easily broken. Features an optical lens, drop-proof, and wear-resistant for a long lifespan. Adjustable Focal Length: The adjustable focal length allows you to clearly view uneven circuit boards. Simply twist the top of the magnifier until the uneven surface is clearly visible. Easy Battery Replacement: Hold the ends of the magnifier with your hands and twist in the indicated direction. It opens to reveal 3 built-in batteries. Replace all three batteries. This magnifier includes 3 AG7 button batteries, which last for 8 hours. Specifications: Magnification: 30X60X Effective Lens Diameter: 30mm Size: 14.81 x 13.00 x 6.10 cm Material: ABS + Optical Lens Color: Black Package Contents: 1 x Jeweler's Magnifier (2 pcs) Note: Package content only includes the magnifier. Other products are not included. Light reflection and different displays may cause the color of the item in the picture to be slightly different from the real thing. The allowable measurement error is +/- 1-3 cm.