Track the time displayed on the parking meter versus the YouTube timer on this video. You'll see a difference of about 3 seconds develop over a period of 30 seconds, indicating the meter is running about 10% fast.
Red light cameras (now banned in Cincinnati) use similar dirty tricks to ensnare unsuspecting citizens with expensive tickets by monkeying with yellow light times.
Over and over again we see that whenever law enforcement is viewed as a 'for-profit' enterprise by government, it ALWAYS leads to abuse. Sign the parking petition today.