Lightcraft LED Headband Magnifier Kit with Bi-Plate Magnification Ideal for close-up precision work, leaving your hand free. This fully adjustable headband includes 4 lenses with bi-plate magnification option and swivel LED spotlight. For professional, craft, hobby or DIY projects demanding close-up work. Fully adjustable headband with bi-plate feature 4 Precision ground lenses with focal lengths from semi close-up to very close-up LED Spotlight - adjustable (2x AAA batteries included) Includes lens case & cleaning cloth Specifications Magnification 1.2x working distance 500 - 600mm Magnification 1.8x working distance 225 - 300mm Magnification 2.5x working distance 125 - 250mm Magnification 3.5x working distance 75 - 125mm Bi-Plate: Magnification 3.0x working distance 155 - 170mm Magnification 3.7x working distance 130 - 140mm Magnification 4.3x working distance 110 - 120mm Magnification 4.7x working distance 105 - 115mm Magnification 5.3x working distance 90 - 100mm Magnification 6.0x working distance 80 - 90mm