Discussion
Which of the following tools is used to check the squareness (angles of \(90^{\circ}\))?
Answer: C
The try square is the tool used to check the squareness of a job, that is, whether two surfaces meet at 90 degrees, and to mark lines at right angles. A staggered square is not a measuring tool, a jenny (odd-leg) caliper scribes lines parallel to an edge and does not check a right angle, and a spring joint square is not a tool at all in this sense. The answer is Try square, option (C). It has a stock and a blade fixed at 90 degrees to each other, and when the stock is held against one edge of a job the blade shows whether the adjoining surface is square.
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