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This International Standard specifies a method for the determination of the direction of twist in yarns, the amount of twist in terms of turns per unit length and change in length on untwisting, by the direct counting method. This method is applicable to:a) single yarns (spun or multifilament); b) folded (plied) yarns; c) cabled yarns. Separate procedures are given for each type of yarn. The method is designed primarily for yarns in packages, but with special precautions the procedures can be used for yarns taken from fabrics. It is not suitable for the determination of twist in a monofilament.