In order to save the hardness of plastics, Albert Shore devised a simple procedure in 1915: a metal tip of a defined shape is pressed against the sample by a spring.
The depth of the impression is then used to determine the hardness or softness of the material. This procedure is described in DIN ISO 7619-1:2012.
Nowadays, two main types of devices are used: Mechanical measuring devices with a pointer and electronic measuring devices.
Both types of measuring devices can be used with test stands. A test bench allows for significantly more accurate and consistent measurements.