Which instrument set is used to verify pressure and flow during commissioning tests?

• A. Pressure gauge and flow meter.
• B. Thermometer and hygrometer.
• C. Valve wrench and pliers.
• D. Tape measure and level.

Answer: (A)

Verifying pressure and flow during commissioning requires instruments that directly measure those two quantities. A pressure gauge provides a direct reading of the pressure in the pipe, while a flow meter quantifies the rate at which water is moving through the system. Together, they confirm that the system delivers the designed pressure and adequate flow, which is essential for proper pump performance, valve settings, and piping layout. The other options don’t measure both pressure and flow: a thermometer and hygrometer track temperature and humidity; a valve wrench and pliers are tools for adjusting components; a tape measure and level check dimensions and alignment. So the combination of a pressure gauge and a flow meter is the correct set.