Optical glass: Folding magnifying glass made with premium optical glass lens for excellent optical performance, durability, high hardness, scratch resistance, and impact resistance. With inch and mm unit scale: Handheld folding magnifier features dual-scale measurements in inches and millimeters for practical use. Fixed scale and focus: 10x pocket magnifier has a folding and standable design with a fixed focus lens and integrated measurement scale. Wide application: Suitable for textile work, thread counting, measurement, small part inspection, watchmaking, jewelry evaluation, fabric analysis, and linen testing. Portable design: Compact, lightweight tri-fold design allows for easy transport. Ideal for users who experience eye strain during close-up tasks. Suitable for various users: Designed for inspecting small components or for individuals needing to examine jewelry authenticity, as well as older adults with visual impairments such as cataracts.