Used to measure growth, elongation and recovery (load and elongation) of low elastic knitted fabrics. That is to say, under certain conditions, the length of the sample after a certain amount of load is measured, and the tension is applied to the sample within a certain period of time, and the difference between the length after removed the tension and the original length. It is mainly used for low elastic knitted fabric such as swimsuit, sports suit, loose body suit or other tight fitting.