Portable Webster Hardness Tester is a portable, fast, accurate hardness gauge that is made in three distinct models for testing aluminum, brass, copper, and mild steel. Portable Webster Hardness Tester will quickly identify tempers and test a variety of shapes that other testers cannot check, such as extrusions, tubing, and flat stock. Each tester model operates in the same manner but differs only in penetrator design, type of load spring, and hardness ranges. The principle of operation is simple. The work to be tested is placed between the anvil and the of the portable hardness testing tool. The pressure is then applied to the handles until the "bottom" is felt at which time the dial indicator is read.