A technician needs a quick approximate measurement of a machined slot in workshop practice. Which task best represents the use of a steel rule?
Checking slot width against a given dimension
A steel rule is a simple graduated scale used for direct, approximate linear measurement, reading dimensions in millimetres or inches.
Placing the rule across a machined slot lets the technician quickly read its width and compare it against the required dimension.
Comparing bore sizes needs inside calipers or a bore gauge, marking positions is a job for a scriber or punch, and guiding straight lines is the work of a straight edge, not the measuring function of a rule.
So the task that matches the steel rule as a measuring instrument is reading the slot width against a given size.
Hence, the answer is Checking slot width against a given dimension.
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