Model : K381 - Yarn Examining MachineĀ To assess the evenness, hairiness, neps and other imperfections in a representative sample of yarn wound at a pre-determined pitch onto a tapered black board. Technical Data: - Show board size : 250 x 220 x 2 mm - Dimensions : 510 x 430 x 360 mm - Power : AC 220 V, 40 W