Shore A,Shore D and Shore O Standard: ASTM D2240 Economical Price I.Introduction:Shore A DurometerIt ... ,bowling,plastic floor and so on.(ASTM--D--2240)Shore O DurometerIt is designed for the hardness of soft and elasticty ... 44.5N 5Kg Top angle(30angle) 2.5mm 0-100mm O 8.1N1Kg Spheric radius2.38mm2.5mm 0-100mm III.Notice ... .When the hardness of A >90,plz use D or O.