Top Quality Optivisor to assist in engraving fine detail. Do not mistake this for other cheaper optivisors. Lenses are optical quality glass. Lens included with optivisor is a LP5 which magnifies 2.5 X at 8 inches of distance. Accessories available for the optivisor include a light and a LP10 Lens which will magnify 2.5 X at 8 inches. This product will greatly improve the fine detail in your work.