Shrinkage occurs when plastic film gets smaller when it is heated for the first time. Before starting on a big project with a material that shrinks, make a test object to determine the projected amount of shrinkage, so that you do not end up with the material that does not fit correctly after heating. Labthink RSY-R2 Film Shrinkage Tester is manual-measure equipment, which FST-02 is an automatic device, which means ll the shrinkage data will be shown up automatically, without manual measurement.