Comparison of pellet hardness measurement made with multiple devices

In common with pellet durability, pellet hardness is one of the criterions used to assess pellet cohesion qualities but, in this case, has more to do with zootechnical issues (i.e. grip quality, livestock chewing mechanisms). The hardness measurement consists in evaluating longitudinal pellet strength during grinding operations. The hardness value corresponds to a maximum compressive stress value taken at the exact moment at which the pellet breaks.