extech decibel meter digital 1).IEC61672 -1 Type2,ANSI S1.4 Type2 2).30-130dB DT-815 extech decibel meter digital815 Sound Level ... Meter is designed for noise project,quality control, illness ... the sounds measurement at factory, school, office, traffic access and household etc. Features: This unit confirms to the IEC61672-1 CLASS2 ...