Here's a brand new watchmakers loupe, one of most popular tools used. This type is made of aluminum for durability. The standard strength of a Watchmakers loupe is 4X (2 1/2" focal length) and 3.3X (3" focal length) power as well. It measures 1 3/8" in diameter which is standard.

Items may be returned within 30 days - buyer pays return shipping (not returnable on International orders)