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When using single pointer models, one should place the sample in the solid plane, hold the hardness gauge, keep the pressure needle at a distance of at least 12 mm from the edge of the sample, smooth enough pressure in the pressure on the sample, and smoothly press on the sample to a full extent.
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When selecting the type, you can poke the material with a ballpoint pen head (about one kilogram of force), the type A with indentation, and the D type without indentation. Type A: for low hardness things, such as rubber, leather & wax.
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Shore D hardness tester is suitable for hardness test of high degree of hardness material, such as common hard rubber, hardened resin, acryl, plexiglas, thermos plastic rubber, printing plate, fibred.
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Still works but I can not opine if it is still accurate. Type D for harder materials.
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(ASTM--D--2240). Dial Scale: 0~100HD. General D type fit for hard rubber, resin, acrylic, glass, thermoplastic rubber, printing plates, fibers, etc. Needle length: 2.5mm. Pressure needle top cone angle of 30°.
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