Linder test apparatus examines the probability of crushing of pellets during direct reduction test. Linder test has been considered as one of the most important laboratory-scale tests. Pellets lose their oxygen during the reduction test and turn to sponge iron. One of the problems in reducing process is that pellets might be crushed. In order to solve the problem, multiple standards stating test’s procedure and the condition of pellet’s crushing meticulously have been imposed. Linder test machine is capable of performing the test based on ISO11257 (Linder), ISO TC 120 / SC3 / 428E (Jambo-Midrex) and ISO13930 Standards.