High-quality lens brings extra clarity and clarity The hand-held lens is very suitable for identifying the signs and tiny details inside the ring, as well as studying geology, coins, stamps, miniature paintings and antiques Loupe dimensions: 56 x 24mm (length x width) Lens diameter: 21mm with a 30x magnification loupe Includes a small ring at the top that can be attached to a necklace or key chain, this ring is useful if you use a magnifying glass in a professional capacity, so you can always reach Great for inspecting gems and diamonds or for the mobile/watch/computer repairing/inspecting