Portable Shore A hardness tester BYK Gardner USA

These portable hardness testers are the worldwide standard for measuring rubber, plastics, and other resilient products.

- Small enough to fit into any pocket
Instruments consist of a spring loaded indentor that is pressed into the sample, giving a relative analog or digital reading of hardness on a 0 to 100 scale.
Various models are specific to the sample being tested. The selection guide below shows the different models with their applications. Generally, readings below 10 or above 90 are considered unreliable; in these instances the next appropriate scale should be used.

Several factors can influence the results obtained with durometers, such as:
- The rate at which the durometer is applied to the test specimen
- The force used in applying the durometer
- The elapsed time between when the durometer is applied and the time that a reading is taken
- The temperature of the test specimen

For the above reasons, several measurements should be taken and averaged on each sample in order to obtain reliable results. Also, when dealing with two party testing, care should be taken to normalize test conditions.

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