Part D Measuring Loudness Set the decibel meter to MAX HOLD. When the loudest sound level is reached the number will be held until something louder comes along. To re-set the meter for the next item turn the MAX HOLD off and then back on. Decibel Meter Settings: Auto. A weighting. Slow Response. Fill in the number of decibels for the following situations: Source Whisper at 5 feet Quiet Classroom Noisy classroom Toilet Flushing Outside dB from decibel meter Similar dB to which object from list on page 164