KHR-500
Automatic Rockwell Hardness Tester
The KHR-500 Automatic Rockwell Hardness Tester, manufactured by K&M Instruments Ltd., is a bench-mounted hardness testing machine designed for direct Rockwell and plastic Rockwell hardness measurements. It applies a preliminary test force followed by a selected main load and automatically performs the indentation cycle, displaying the hardness value digitally. The tester is suitable for quality-control testing of carbon steels, alloy steels, cast iron, non-ferrous metals and engineering plastics, and it supports a wide range of Rockwell scales including HRA, HRB and HRC. Its automatic operation improves repeatability and reduces operator influence, making it appropriate for laboratory and industrial hardness verification tasks.