What equipment is often used to monitor water system pressure?

A pressure gauge is the appropriate equipment used to monitor water system pressure. It measures the pressure of the water in the system and provides a visual indication of this pressure, which is crucial for ensuring the system operates within safe and efficient parameters. Monitoring pressure helps in identifying issues such as leaks or blockages and is essential for maintaining the overall functionality of the water system.

The other options do not serve this purpose effectively. A flow meter measures the rate of water flow, which is important for different operational insights but does not provide direct information about pressure levels. A water level sensor detects the level of water in a tank or reservoir, and while it can indicate when the system is running low on water, it does not measure pressure. A temperature probe measures the temperature of the water, which is useful for various applications but not for monitoring pressure.