... ,SD,Ld,Ln,Ldn,1/1 frequency spectrumFilter characteristics1/1 frequency intervalcentre frequency: 31.5Hz,63Hz,125Hz,500Hz,1kHz ... ,2kHz,4kHz,8kHzMeasured data automatic storage500 teams single team+50 ... for external powerDimensions Main machine: 240mm×81mm×31mm Printer: 178mm×81mm×31mmWeight 0.4kg , printer: 0.41kg digital noise frequency ...