Hand-held hardness tester although in the use of a lot of convenience, but in the application of a lot of restrictions.
Generally speaking, the hand-held hardness tester can only measure the standard rubber block. The standard block should meet the thickness of 6mm and the circular area of no less than 24mm diameter.
There are also a number of operational considerations, such as holding the durometer as tightly as possible and pressing down at a 90 degree vertical Angle until the probe is fully embedded in the sample.
If an analog hardness tester is used, after the probe is completely pressed into the sample, it needs to be silently counted for 3 seconds. The hardness value after 3 seconds is the hardness value in the standard specification and the most stable hardness value.
Hand-held durometers are often misused in thin rubber parts, such as o-rings that do not provide adequate measurements of area and flesh thickness. This application is incorrect and may result in incorrect measurements.