... watch, camera, cell phone and other subminiature parts. Optical Head Magnifier (Optical Instrument)Hongguang Optics is the leading manufacturer for ... produced 3 types of head magnifier, now, with 10 years manufacture experience, we have near 20 models head magnifier, including Led, ... parts and observing curio, stamps and other microminiatures. Length of head belt: About 50-60cm. Battery: AAA UM-4*2All ...