Magnification: 1.8× Lens Type: Dome-style Brightfield magnifier Optical Design: Sits directly on the reading material to provide a stable, tremor-free image Image Quality: Bright, clear and distortion-free across the viewing area Light Management: Dome design naturally concentrates ambient light to improve contrast and readability Lens Materials: 1420 / 1421: Optical glass 1424: PXM® lightweight plastic Sizes: 1420 / 1421: Large dome 1424: Compact dome for portability Special Feature (1421): Removable red reading line guide to assist with line tracking Recommended Use: Reading books, newspapers, labels, mail, maps and small print where steady magnification is required Design Benefits: Comfortable viewing with the object and image plane close together for reduced eye strain Portability: Compact and easy to carry for use at home or on the go