When checking discharge pressure gauges, any gauge that is off by more than ____________ must be adjusted.

In the context of maintaining and operating firefighting equipment, it is critical to ensure that discharge pressure gauges are functioning accurately. A gauge that is off by more than 10 psi indicates a significant deviation from the expected performance, which can lead to miscalculations in water flow and pressure management. Using an inaccurate gauge can compromise the effectiveness of firefighting efforts, as it may lead to either an underestimation or overestimation of pressure.

Ensuring that gauges are adjusted when they deviate more than this threshold helps maintain the integrity of the system, allows for reliable pressure readings, and ultimately supports the safety and efficiency of fire operations. It is essential for driver/operators to routinely check and calibrate these gauges, as precision in pressure measurements is vital during emergency response situations.