Total transparency and accuracy in yarn count is regarded as one of the most crucial quality parameters for yarn trading and yarn processing. Even the slightest variations in yarn count can cause serious fabric defects such as striping, ruining the finished product. So, it’s obvious that control of this parameter is important. Any control is better than none at all, and standard manual methods fall into this category. Automatic measurement of absolute yarn count – and its variations – is therefore much faster, reliable and easier, using the Sensor FA with the USTER® TESTER 6. But how accurate is this high-speed solution? Detailed testing regimes at two spinning mills, in Europe and the USA, provided the answer.