What is the gauge zone range?

• A. 0-1 INWB
• B. 2.5-3.5 INWB
• C. 1.5-2.5 INWB (2.0 +/- 0.5)
• D. 3.0 INWB

Answer: (C)

Gauge zone range is the acceptable reading window for a gauge, centered on the nominal value and defined by its tolerance. Here, the standard reading is 2.0 INWB with a tolerance of ±0.5 INWB. That gives 1.5 to 2.5 INWB as the usable zone. The other options don’t fit because they either sit away from the 2.0 target or aren’t a range (one value only). So the correct gauge zone range is 1.5 to 2.5 INWB.