The REED R9030 is a compact, pen-style rebound (Leeb) hardness tester built around a universal D impact device, letting a technician take quick spot checks on metal parts without lab equipment. It converts readings across seven scales -- Rockwell (HRC, HRB, HRA), Brinell, Leeb, Vickers and Shore -- so it can be used on cast steel, alloy steel, stainless steel, aluminum, bronze, copper and cast iron. A bright OLED display, rechargeable battery rated for roughly 40 hours of use, and onboard memory for hundreds of stored readings make it convenient for fieldwork and later data review.