Using a Durometer to measure the hardness of sponge rubber

A fast way people use to check the hardness/softness of closed cell sponge is with a Shore Durometer device. Normally the “oo” scale. Using a hand held Durometer is very subjective, hand pressure, ambient temperature, cell size of the sponge are just a few of the variables that make the procedure not technically reproducible. ASTM [...]