Used for measuring number of twist cotton, wool, silk, twine and chemical fiber. Standards:GB/T2543.1 GB/2543.2 Main Technical Data Measuring Methods AíóDirect counting BíóUntwist-retwist method CíóThree-time Untwist-retwist method. Measuring Length 25mmú¼50mm 100mm,250mm,500mm. External Dimensions L1080í-W275í-H216mm.