Discovery Crafts DHD 20 head loupe. Discovery Crafts DHD 20 is a head magnifier that is useful for precision work. It is also useful for assessing surface defects and reading small print or drawings. The magnifier is hands-free, offers a high degree of magnification and has an integrated light. Its functions are useful for jewellers, watchmakers, model makers, service technicians and many others. The magnifier uses three individual lenses that can be combined with each other: two rectangular lenses and a small circular lens. The small lens is for the right eye only. Four magnifications are available, the highest magnification is only possible for one-eyed observations. All lenses are made of optical polymer glass with high transparency and the magnifier is attached to the head with a size-adjustable headband. Batteries are required for illumination. Illumination included. 2x AAA batteries (not included). Two main lenses, one flip-up lens for the right eye. Lens diameter: 87 mm. Diameter of the insert lens: 28 mm. Magnification of the lenses: 1.5 x / 3 x / 6.5 x / 8 x. Optical material: optical polymer glass. Adjustable headband. Colour: blue.