SOUND LEVEL METER The Nova Model 43 (Type 1) and Model 44 (Type 2) are Integrating Sound Level Meters that are ideal for occupational noise assessments and checking the suitability of hearing protection. Sound Level Meter Standards ANSI S1.4 and ANSI S1.43 Type 1 or Type 2 IEC 60651 and IEC 60804 Type 1 or Type 2 IEC 61672 Class 1 or Class 2 Sound Level Meter Standards ANSI S1.4 and ANSI S1.43 Model 43 - Type 1 Model 44 - Type 2 IEC 61672-1:2002 Model 43 - Class 1 Model 44 - Class 2 IEC 60804:2000, IEC 60651:2001 Model 43 - Type 1 Model 44 - Type 2