Which practice helps maintain the accuracy of a steel rule during daily use?
Avoid dropping on floor
A steel rule stays accurate only while its edges and graduations remain straight and undamaged.
Dropping the rule can bend it or nick the measuring edge, after which readings become unreliable.
Measuring hot parts can distort the rule, and unnecessary washing or hourly oiling do not protect its accuracy.
Hence, avoiding dropping it on the floor is the practice that maintains a steel rule's accuracy.
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