Simply count the number of protruding Tabs along the inner brim of your Screen or Grinding Cup.Newer versions:Fine and Coarse Screens have 4 tabsGrinding Cup has 2 tabsOlder versions:Fine and Coarse Screens have 6 tabsGrinding Cup has 3 tabsRefer to the Soyabella SB-130 / SB-132 user manual for more information.