The cam plastometer is a physical testing machine. It measures the resistance of non-brittle materials to compressive deformation at constant true-strain rates. In this way, it can be compared a bit to the Gleeble(R). In the early days, the machine operates at relatively low strain rates, but over time it has been enhanced and currently it can operate over a wide range of strain rates The machine is patented under the name of "United States Patent 4109516". The cam plastometers are expensive and there are only a few of them in the world.