When conducting a flow test, the pressure gauge reading is determined by ____________.

In the context of conducting a flow test, determining the pressure gauge reading is effectively achieved by taking the mean of high and low readings. This method provides a more reliable and accurate representation of the system's pressure under flow conditions, as it mitigates the impact of transient pressure spikes or dips that may occur during the test. By averaging the highest and lowest readings, the test results offer a balanced view that reflects the typical performance of the sprinkler system, accounting for any temporary fluctuations that might not indicate the overall system behavior.

This approach is crucial in ensuring that the flow test outcomes are useful for assessing the sprinkler system's capabilities and making informed decisions regarding design, installation, and maintenance. It helps in achieving a clear understanding of the available water pressure that can be utilized effectively for fire protection.