On the hardness of cattle particles

I would like to ask you how to measure the hardness of granular materials, which range is better to control the hardness of cow particles-cow particle hardness, this is not clear! -I don't know! -usually use the feed hardness tester to test the feed hardness.-can you reply to the wangxinna tablet hardness tester? what range should the cow feed hardness be kept?-reply "hl43802960 should be able to do so. However, they generally use a special feed hardness tester-there is no special requirement for cow hardness, as long as it is not too hard, the pulverization rate can be controlled.