The RH AUTO Rockwell hardness testers are modular Rockwell testers adaptable to many applications. They can serve as desktop hardness testers, portable Rockwell testers, sheet metal testers, metal tube testers or metal ball testers. The RH AUTO becomes a desktop tester when attached to column stand and automatically and quickly performs Rockwell hardness tests on parts of various sizes. By separating from the column stand it becomes a portable Rockwell tester, perfect for testing in the field, orientated in any direction to test around large and heavy parts. It is also perfect for performing Rockwell hardness tests on bulky and heavy sheet metal with various retaining frames for different thicknesses. By attaching either a tube test frame or ball testing frame, it can automatically perform Rockwell hardness tests on ball surfaces and on tube walls.