True or False: If the tension is correct when using a steel tape, but there is sag, the measurement is accurate.

Answer: B — False

In the context of using a steel tape for measurements, it is important to understand that tension and sag both play crucial roles in obtaining accurate readings. When a steel tape is held with the correct tension, it means that the tape is pulled tight, reducing any slack that can distort the measurement. However, if there is sag in the tape, it means that the tape is not being held in a straight line from one point to another due to gravitational pull, which creates an arc between the points being measured. This sag introduces an error in the measurement because the distance measured along the tape will be greater than the actual straight-line distance between the two points. Therefore, even if the tension is correct, the presence of sag means that the measurement cannot be considered accurate. This reasoning leads to the conclusion that the statement is false; accurate measurements require both correct tension and a straight line without sag.