YG381A型用于摇取棉、化纤纱线。按GB/T9996标准检查纱线外观评级，还可按GB/T403-78标准进行测试。
YG381M型用于摇取毛、麻纱线。按FZ/T20017标准检查毛纱外观评级。
Model YG381A is used for winding and taking cotton yarn or chemical fiber yarn. Check the appearance of yarn and appraise its grade in accordance with GB/T9996 and can also test in accordance with GB/T403-78.
Model 381M is used for winding and taking wool yarn or hemp yarn. Check the appearance of yarn and appraise its grade in accordance with FZ/T20017.

主要技术参数：Main Technical Data：
1、黑板机规格 Sizes of black board
YG381A:250*180*2mm
YG381M:300*225*5mm
2、摇纱密度 Density of rocked yarn：
YG381A:7、9、11、13、15、19根pieces/10mm
YG381M:35、45、55根pieces/10cm
3、外形尺寸 Outline size：
YG381A:L630*W430*H400mm
　YG381M:L600*W420*H400mm