5 Replaceable/Interconvertible lens with different magnifications marked in the middle LED light can be rotated about 60 degree and light source box with battery compartment is detachable Adjustable head band ensures more comfortable and tight head wearing Light source box can be used separately as lighting source after being dismantled Widely used in mechanical processing electronic repair jewelry appraisal timepieces repair and miniature engraving etc Specifications: Single-plate lens magnifications: 1.0x 1.5x 2.0x 2.5x 3.5x Bi-plate lens magnifications: 3.0x 4.0x 4.5x 5.0x 5.5x 6.0x Magnifications are marked in the middle of lens Table below denotes the distance proportion between magnifications and viewed objects: 　 Magnifications Distance to viewed objects 1.0x 300 ~ 350mm 1.5x 240 ~ 260mm 2.0x 215 ~ 235mm 2.5x 205 ~ 225mm 3.0x 160 ~ 180mm 3.5x 135 ~ 145mm 4.0x 125 ~ 135mm 4.5x 110 ~ 130mm 5.0x 100 ~ 120mm 5.5x 80 ~ 95mm 6.0x 60 ~ 85mm LED: 2 Pieces Lens: 5 Pieces Battery: 3 * 1.5V AAA batteries (NOT included) Head circumference: Adjustable Lens material: High quality PC Headpiece material: Environmental protection acrylic Applications: Timepiece repair jewelry appraisal miniature engraving etc. Color: Black + White Size: 25.5*20.5cm/10.03*8.07 Quantity: 1pc