Đồng hồ đo độ cứng cao su, nhựa PTC Shore O Scale Pencil Durometer 201/O
Type O durometers measure the hardness of soft printing rollers, nylon, rayon, orlon, artgume, and textile windings.
This durometer's 1/2" diameter base (1.3cm) is the smallest base permitted by ASTM D2240 specifications. This allows it to be used in confined or hard to reach areas other durometers cannot test.