Plumbers can check water meter readings to diagnose a leak, but most plumbers focus on finding leaks and performing plumbing repairs, not reading meters. Any homeowner can read his or her own meter by checking the box, and the monthly reading will go directly to the water company via meter-box technology.
Reading a water meter is one way to determine if a house or business has a water leak. If the meter detects water usage during a time where no water is being used, then that is a sign there could be a leak. A plumber can look at recent meter readings to help diagnose a leak, but most plumbers have technology that helps detect the location of a leak without consulting the meter.