Lee Lead Hardness Test Kit will determine the exact Brinnell Number of an alloy in a simple 6 step process. Included is the Lee Pocket Microscope. Featured product in Chapter 10 of Modern Reloading. No more wasted components shooting too soft or too hard lead. Cast and load with confidence knowing your alloy is up to the job. Quickly and precisely check hardness of your lead alloy. Exclusive conversion chart tells the maximum operating pressure of any lead alloy.