Magnifier is composed of ek. lenses are coated with anti-reflection coating. Instrumentation scale is made of glass and has a graduation 0.1 mm in length measuring 30 mm with a central zero. Dandruff body comprises a circular ring fitted with 8 LEDs that provide a bright and high-contrast exposure measurement field. Illumination is activated via a button (not switch) on the side of dandruff. Magnification: 10x Lighting: 8x LED Sharpening: Yes Field of view: 34 mm Measuring length: 30 mm (15-0-15) Scale (1 / DIV): 0.1 mm Optical properties: achromatic, distortion-free Dimensions 46 x 44 mm Weight 74 g Case included Battery: 4x AG9 (button batteries) - supplied