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Material of Magnifier: hard resin lens Power: 3 AAA batteries Observing pores, manicure, etc. Assemble or repair small fitting. Repair accessory for camera, watch, etc. Stamp collecting, jewellery, printing, etc. Suitable for Dentist, tailor, embroidery workers. Interesting work such as carving, handcraft and sewing. All the lenses of this glasses series are interchangeable. Detachable bulb devices; the angle of lamplight can also be adjusted. Outdoor activities, home use, and processing, installation & repairing in electronic industry