Description◆Product FeaturesExcellent resolution of 63 lines/mm or more, and excellent correction of distortion aberration.Excellent airtightness when the lens is stored, and is effective for high-precision appraisal of jewelry and precision processing.The holes are reinforced with metal, and stylish chains can be used.■SpecificationsSize (length x height x width)42mm x 24mm x 16mm (when lens is stored)Weight (mass) 15gEffective lens diameter 13mmMagnification 10 (±1%) timesLens material Optical glass (3 sheets bonded together)Focal length 25mm All my products are 100% Authentic. Please feel free to contact us if you have any question. Payment We usually ship within 5〜10 business days of receiving cleared payment. Shipping We ship using FedEx, DHL and Japan Post.International Buyers - Please Note:Import duties, taxes and charges are not included in the item price or shipping charges.These charges are the buyer’s responsibility.Please check with your country’s customs office to determine what these additional costs will be prior to bidding/buying. These charges are normally collected by the delivering freight (shipping) company or when you pick the item up do not confuse them for additional shipping charges. I do not mark merchandise values below value or mark items as "gifts" - US and International government regulations prohibit such behavior. *About electrical appliances Check the voltage in your home. If it says 100VAC in the specifications or description, it is a Japanese specification item. They require a transformer or conversion plug. Please check the voltage and plug type before purchasing at your local store. If you use the item forcibly as it is, the item will malfunction. In that case, we will not be held responsible.