Final answer:
Both Technician A and B are correct. The hook on a measuring tape is for accurate placement, and the built-in lock prevents it from retracting. A tape measure is versatile, covering various units such as feet, yards, and meters, whereas a ruler is best for smaller measurements in millimeters or centimeters.
Step-by-step explanation:
When it comes to measuring tape, Technician A is correct that the hooked end should be placed over the edge of the object being measured. This hook is designed to latch onto the edge, allowing for an accurate measurement. As for Technician B, they are also correct; a measuring tape typically has a built-in locking mechanism that can be engaged to prevent the tape from retracting. This lock holds the tape measure in place, making it easier to read measurements.
In terms of tools for measuring various units, a tape measure is highly versatile. It often contains both customary and metric units, suitable for measuring units such as feet, yards, and meters. For smaller objects like paper clips, millimeters or centimeters may be the appropriate units, which can be accurately measured using a ruler. Choosing between a tape measure, yardstick, or meter stick would depend on the size of the object and your measurement needs. For longer distances and flexible measurements, a tape measure is advantageous.