◆ Product features It has excellent resolving power of 63 lines/mm or more, and distortion is well corrected. Excellent airtightness when the lens is stored, demonstrating its power in high-precision appraisal of jewelry and precision processing. The through hole is reinforced with metal, allowing the use of a stylish chain. ■ Specifications Size (Length x Height x Width) 42mm x 24mm x 16mm (with lens retracted) Mass (weight) 15g Lens effective diameter 13mm Magnification 10 (±1%) times Lens material Optical glass (three sheets bonded together) Focal length 25mm .
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