instrument for measuring hardness of substances
• (n.) An instrument for measuring the degree of hardness; especially, an instrument for testing the relative hardness of steel rails and the like.
A gauge to measure the hardness of an elastomeric material. 
The measurement of hardness of a material. A gauge to measure the hardness of an elastomeric material.
Du·rom'e·ter noun [ Latin durus hard + -meter .] An instrument for measuring the degree of hardness; especially, an instrument for testing the relative hardness of steel rails and the like. 
A measure of the hardness of a resin. It is measured on a numeric scale with numbers ranging from lower (i.e. softer) to higher (i.e. harder)
The measurement used to determine the hardness of a plastic ski boot shell; the lower the durometer, the softer the shell.
Instrument for measuring the hardness of a material. Plastic materials can have different shore hardnesses depending on the requirements of the plastic extrusion’s final applications. The durometer measures the depth of an indentation in the material created by a given force on a standardized presser foot.
A scale of 1 to 100 that measures the firmness of a mid-sole material, low numbers being softer than higher numbers.
a device for measuring the hardness of materials, esp. metals.
a numerical scale for measuring the hardness of rubber or plastic based on the depth of penetration of an indenter point on the surface of a test specimen.