Automatic 1:1 Octave Band Mode Ideal for those preferring the 1:1 Octave Band method of hearing protection selection The basic measurements of the Models 81A & 82A with the addition of 1:1 Octave Band Measurements from 31Hz to 8kHz Outstanding Analyser software supplied as standard Blue LED indicator to show that you are using Octave Band Mode The instrument automatically sweeps through the information upon completion of the measurement cycle The Octave Bands are correctly measured in ‘Z’ weighting and an overall ‘A’ weighted Leq is included for comparison