曲尺（英語：Try square）是木工或金屬加工工具，一邊長一邊短的直角尺。用於衡量一個標記和一塊木頭 。這個工具的主要用途測量精度直角（90度）的表面。有些角尺上標示公制或英制刻度以方便測量。
參考書籍
- 《機械測量入門》，安改娣,格日勒，化學工業出版社，ISBN：9787122009180 / 7122009181
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