... 5. Needle indicates Function:Shaw rubber hardness gauge is an apparatus to measure vulcanized rubber and plastic products.This apparatus ... above, and this kind of material is made of rubber plastic and has blister in plastic. This hardness gauge ... 93, JJG304-2003.Parameter:Type A: applicable to general rubber, synthetic rubber, vulcanized rubber, soft rubber, leather, wax, etc. Type C: applicable to ...