Millimetres, scaled or otherwise.■

The Shore hardness is measured with an apparatus known as a Durometer and consequently is also known as 'Durometer hardness'. The hardness value is determined by the penetration of the Durometer indenter foot into the sample. Because of the resilience of rubbers and plastics, the hardness reading my change over time - so the indentation time is sometimes reported along with the hardness number. The ASTM test number is ASTM D2240 while the analogous ISO test method is ISO 868. ■

The thread starter muses an enquiry, dare I say pitches; the question of units. Shore Hardness is not a recognised ISO unit of measure but a proprietary expression of the penetration depth achieved under various test conditions laid down in Standards. Regardless of any test procedure, test equipment, hysteresis, de polymerisation or anything else we can imagine, the unit which describes deformation is either metres or millimetres.

But the links are quite useful.

PS: The Adminstrator deleted the links, because it looked like the question was only posed as a hidden advertisement.

rhw ■