A steel bench rule is used when extreme accuracy is necessary.

• A. True
• B. False
• C. Only for rough measurements
• D. For measuring temperature

Answer: (A)

In precision measurement, the tool you choose must keep its shape and markings true under use. A steel bench rule provides a stable, straight edge with finely ground and etched graduations that resist wear. This means the readings stay consistent over many measurements, which is essential when extreme accuracy is required. Wooden or plastic rules can warp with humidity, wear more quickly, and lose calibration, leading to errors. So for tasks where precision matters most, a steel bench rule is the appropriate choice. It’s not about measuring temperature or rough layout—the strength here is maintaining accurate, repeatable measurements.