Durometer

Noun

1. An instrument used to measure the hardness or stiffness of a material, especially of an elastomer, such as rubber. A simple durometer consists of a movable tip on a spring with a dial gauge.

   "She tested the sample with a durometer to verify its consistency."

2. The measurement of the hardness or stiffness of a material, especially of plastic or rubber.

   "They specified a 70 durometer polyurethane."