The LumiLoupe series stand magnifiers from Carson will reveal intricate details that makes the ordinary extroadinary. Pre-focused dual lenses allow examination of objects close up, while a transparent acrylic base permits ambient light to illuminate your subject for sharp, bright and crystal clear viewing. The LumiLoupe series stand magnifiers are great for detailed inspection of many things such as stamps, film negatives, photography, printing pixels, coins, currency, miniatures, detecting counterfeit documents, wildlife and so much more! The LumiLoupe series stand pre-focused loupes are available in 4 different styles. There are two different versions for the 10x magnification (LL-10 and LL-20). These two loupes are identical in size and magnification. However, the LL-20 version comes included with a snap-on reticle that measures in millimeters and inches. The LL-10 version does NOT come included with a reticle. The LL-55 version features a 4.5x power magnification and has the largest lens diameter of the group (2.65 inches). The LL-77 version features a 7x power magnification and has a lens diameter of 1.75 inches. The LL-10 and LL-20 models both have a 1.0 inch lens diameter. Please keep in mind that the higher the magnifcation, the shorter the focal length. This means that you will have to place your eye closer to the lens with the higher powered versions in order for you subject to appear sharp and in focus. At Carson, we strive to make sure our customers are 100% satisfied with the quality of our magnifiers. We are so confident in our magnifiers that we back them with a lifetime limited warranty! Carson will repair or replace your magnifier if it is found to have manufacturing defects in materials or workmanship. Please contact Carson for additional warranty details.