SOUND LEVEL METER The Nova models 45 and 46, are integrating sound level meters with real-time octave band filters. This is a data logging meter that comes complete with the Pulsar Analyzer Plus software. These models come with all the Nova options fitted - there is nothing to add. Data logging, octave band filters, environmental Ln parameters, automatic timers, everything is already in there. Sound Level Meter Standards ANSI S1.4 Type 1 or Type 2 IEC 61672 Class 1 or Class 2 IEC 60651, IEC 60804 Type 1 or Type 2 ANSI S1.11 and IEC 61260 for Octave Band Filters Sound Level Meter Standards ANSI S1.4 and ANSI S1.43 Model 45 - Type 1 Model 46 - Type 2 IEC 60804:2000, IEC 60651:2001 Model 45 - Type 1 Model 46 - Type 2 IEC 61672-1:2002 Model 45 - Class 1 Model 46 - Class 2 Octave Band Filters: IEC 61260 and ANSI S1.11