Our portable hardness testers are made in three distinct models, B, B-75 & BB-75, for testing brass, aluminum, copper, and mild steel. They allow you to quickly identify tempers and test a variety of shapes that other models simply cannot check—including tubing, extrusions, and flat stock. Every one of our tester models operates in the same manner, the only differences are in the type of load spring, hardness ranges, and penetrator design. Operation is simple, the work being tested is placed between the anvil and penetrator, pressure is applied to the handles until the bottom is felt and then the dial indicator is read.
The Model B Tester is designed to cover the hardness of aluminum alloys in several models. It quickly identifies tempers and with its 20 graduations on the dial indicator covers a range between 25 and 110 on the Rockwell E Scale.
The Model B-75 obtains a more sensitive response in testing the hardness of stronger aluminum alloys as well as mild steel. The B-75 covers the range from annealed to full-hard for brass. It is accomplished by incorporating a penetrator of slightly different contours and a heavier load spring than used in the Model B, and the 20 graduations on the dial indicator cover the range between 20 and 100 on the Rockwell B Scale.
The Model BB-75 rapidly tests the hardness of electrodeposited copper in the low hardness range. The B-75 is used to give sensitivity while the Model B load spring is employed to give light pressure. This combination allows users to test the soft range of many common materials.