TE143旨在检查文档复制的可读性。 在模式号84中，八边形内的两条线的方向必须对于八个符号中的七个没有问题地被识别。
The TE143 is designed to check the readability of document reproductions. In pattern number 84 the direction of the two lines inside the octagon must be recognized without problems for seven out of eight symbols.
