HY0331E Automatic Yarn Twist Tester is used to determine the twist of single or plied yarns via the conventional method or untwist/re-twist method. This instrument complies with the following international and industry standards: ISO: ISO 2061; ASTM: ASTM D1422/1423; BS: BS 3356; GB/T: GB/T 2543.1. It is suitable for various yarns. Pre-tension is adjustable based on yarn categories. Adopting micro-computer control, it features automatic data processing, display and printout, ensuring accuracy, stability and reliability. It can also be connected to a computer for additional analysis functions. Equipped with an imported dedicated clock circuit, the system time can be printed on the report. The yarn holder is directly driven by a motor with stepless speed regulation; it is also designed with a speed measurement function to accurately determine the rotating speed of the yarn holder (motor). Technical Specification Model: HY0331E Twist range: 1~9999.9 twists Max tubes of sample: 20 Max testing times per tube: 20 times Linear density: 1~499.9 tex Test length: 100, 250, 500 mm (selectable) Test method: Direct counting method; Untwist/re-twist method (method A); Untwist/re-twist method (method B); Three-cycle untwist/re-twist method Test speed: 100~3000 r/min, stepless adjustable Extension range: < 20 mm Compressed air: 0.5~0.8 MPa Power supply: AC 220V±10% 50Hz Rated power: 400 W Dimensions: 1500 mm × 400 mm × 300 mm Weight: 60 kg