FLB-5x-10x-15x Folding Triple Lens Value Priced Compact Pocket Magnifier with 5x10x, 15x. Use first single lens for 5x, use second single with the first for 10x, use all 3 for 15x. Swings open open for use and closed for protective storage. Ideal Magnifier for portable inspection tool, as well as reading small print,text, inspecting parts, coins, stamps, quality control, This model is also known as the FLB-5x-10x-15x with the national stock number NSN 6650-01-655-0762 for the Dept of defense and other federal agencies for inspection tasks.