GXG-1987 1.5X 2X 2.5X 3.5X Double Lens Head-mounted Headband Reading Magnifier Loupe Head Wearing 4 Magnifications 4 Replaceable/interconvertible magnification lens plates to meet different magnifying needs Lens are ground and polished to precision ophthalmic standards The shell frame is made of lightweight, durable and impact resistant materials Adjustable head band for more comfortable and tight head wearing Widely used in mechanical processing, electronic repair, jewelry appraisal, timepieces repair and miniature engraving, etc