TE143旨在檢查文檔復制的可讀性。 在模式號84中，八邊形內的兩條線的方向必須對于八個符號中的七個沒有問題地被識別。
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.
