Which statement defines a scale tolerance?

• A. The range of acceptable readings around a target value
• B. The exact target value
• C. The maximum measurement capacity
• D. The smallest measurable unit

Answer: (A)

Scale tolerance defines the allowable range around the target value where readings are considered acceptable. It acknowledges that measurements vary and instruments aren’t perfect, so measurements within this band are still okay. For example, if the target is 50 with a tolerance of ±1, readings from 49 to 51 pass. This is different from the exact target value (ideal but not practical), the instrument’s maximum capacity (its full usable range), or the smallest measurable unit (the resolution of the scale).