Not much information can be found on the correlation between measurements
conducted on all of the types of equipment mentioned, except for the Holmen durability
tester and Pfost tumbling Can. Data from McKee (19901, indicated that for the Holmen
pellet tester there was a linear decrease in durability, ranging from approximately 95%
to 60% with testing time, up to 5 min. The F’fost tumbling can showed a curvilinear
decrease, ranging from approximately 98 to 91% with time, up to 20 min. From these
results it can be concluded that the Holmen pellet tester gives results in a wider range
and in a shorter timespan than Pfosts tumbling can.