✅Only for Monocular Use, Not a Binocular Magnifier - CAN NOT use it with both eyes since the magnification is too strong. Using a single eye to view object only because focus will fail when using both eyes lenses at the same time.
✅NOTE: The focal length from lens to object is 0.5-1.5 inch (0.5-3.8cm). The Focus length is too much close to read book.
✅Easy to be interchanged - 4 Pairs replaceable magnification lens(10x 15x 20x 25x Lens). Rotate the LED switch CAP about 30 degrees clockwise to turn on the light.
✅Interchangeable Bracket and Headband - Comfortable eyeglass frame or replace with a headband to ensure tight wearing and reduce fatigue for long time use.
✅A perfect tool to inspect object under a magnifier. Widely used in mechanical processing, electronic repair, jewelry appraisal, timepieces repair and miniature engraving, etc.