It's just a clear-acrylic letter opener, but it has (5) functions. There is a 5/8" dia 4X magnifying lens, and a 2-1/2" x 1/2" magnifying bar that is 1.5X. Add in the ruler that measures up to 3" and up to 7cm. Plus the 7-3/4" long paper knife. All in one tool. All at your fingertips every time you open the mail. All for a pittance.