In this study, the effect of different test speeds on yarn hairiness results in the Zweigle G657 device was investigated. Measurements were carried out at four different test speeds of 25 m/min, 50 m/min, 100 m/min and 400 m/min, which are available as options on the device. The effect of test speed was analyzed statistically using the SPSS program. It has been seen that the change in test speed has a direct effect on the yarn hairiness results. It has been observed that the difference between test speeds up to hairs in 10 mm in the classification of hair numbers is significant. These differences between them became insignificant after hairs in 10 mm. It can be generally said that an increasing trend was observed in the yarn S3 hairiness values as the test speed increased. However, different results were obtained in the yarns of different structures selected for the study different from the literature. It is clearly seen that it would not be appropriate to use the obtained results from different speeds for various comparisons. There is a tendency for higher test speeds on newer version devices. For this reason, it has been deduced that it is necessary to give the information on which device and at which test speed it was measured while giving the S3 hairiness information.