When checking the high rise pressure gauge's accuracy, if the reading is more than +/- _____ psi, it should be placed out of service.

The correct value of more than +/- 5 psi indicates the threshold at which a high rise pressure gauge should be considered inaccurate and subsequently placed out of service. This standard is important because pressure gauges are critical for ensuring that firefighters can make informed decisions about water supply and pressure management during operations in high-rise structures. When a gauge is off by more than 5 psi, it could lead to improper assessments of the water pressure available, which in turn could compromise safety and effectiveness during firefighting operations.

This threshold is designed to maintain high safety and operational standards within firefighting practices. If left unchecked, an inaccurate gauge could cause firefighters to overestimate or underestimate the pressure, potentially resulting in either inadequate water supply or excessive pressure that could damage the system. Therefore, adhering to the correct standard of +/- 5 psi is crucial for reliable measurements and safe firefighting efforts.