5 Replaceable/Interconvertible lens with different magnifications marked in the middleLED light can be rotated about 60 degree and light source box with battery compartment is detachableAdjustable head band ensures more comfortable and tight head wearingLight source box can be used separately as lighting source after being dismantledWidely used in mechanical processing， electronic repair， jewelry appraisal， timepieces repair and miniature engraving， etcSpecifications:Single-plate lens magnifications: 1.0x， 1.5x， 2.0x， 2.5x， 3.5xBi-plate lens magnifications: 3.0x， 4.0x， 4.5x， 5.0x， 5.5x， 6.0xMagnifications are marked in the middle of lensTable 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 ~ 85mmLED: 2 PiecesLens: 5 PiecesBattery: 3 * 1.5V AAA batteries (NOT included)Head circumference: AdjustableLens material: High quality PCHeadpiece material: Environmental protection acrylicApplications: Timepiece repair， jewelry appraisal， miniature engraving， etc.Color: Black + WhiteSize: 25.5*20.5cm/10.03*8.07"Quantity: 1pc