? how do you know that the noisemeter was working correctly ,if they are going to penalise you using a industry standard piece of equipment it must be 1/ calibrated on a regular basis 2/calibration certificate available for scrutiny at the time of record (after the fact wont stand up in court ) 3/ operated in a correct manor with no close proximity to sound reflective objects ie walls other vehicles etc ,and not in any position to be influenced by outside forces ie traffic noise wind noise etc .and last but not least operated by trained personell,,write to them requesting to come and inspect the equipment used and view its calibration details on the meter ,also the calibration certificate that was current for the equipment used on your car on the day, wait for them to decline and then write back saying if they are not willing to provide documented proof and the opportunity to inspect the equipment you will take your chances in court