Optical Tool Store.
One of the most essential tools for collectors is a quality magnifier. They are the primary tool for examining condition and authenticity of collectibles. For general stamp and coin collecting, a magnification level of 5x to 10x is suitable for basic purposes of grading, inspecting watermarks, and distinguishing printing methods. For inspecting security feature microprinting as used often on stamps, you will want 10x or more magnification. A measuring scale included in your magnifier may be desired at times for error and counterfeit and forgery detection.