What is the annual TBI/TSET accessories tolerance?

• A. 0% from baseline
• B. 2% from baseline
• C. ±1% from baseline
• D. ±3% from baseline

Answer: (B)

Tolerances measure how much a measurement can drift from its baseline value over time. For TBI/TSET accessories, the annual tolerance is 2% from baseline. This means the measured value should not differ from the baseline by more than 2% in a year. This 2% figure hits a practical middle ground: it’s tight enough to catch meaningful degradation but not so strict that normal ageing or minor fluctuations trigger unnecessary maintenance. For example, if the baseline is 100 units, the value should stay within about 98 to 102 units. Choices like 0% would be too strict, ±1% tighter than typical, and ±3% looser than desired, so 2% is the best balance for reliable operation while keeping maintenance reasonable.