... , fan cover, horologe screwdriver, briefcase Modal TL6288BMeasuring range A sound level:30-135dB C sound level:35-135dBLinearity: ... Lmax,SD,Ld,Ln,Ldn,1/1 frequency spectrumFilter characteristics1/1 frequency intervalcentre frequency: 31.5Hz,63Hz,125Hz,500Hz,1kHz ... and microcomputer communication to print measured data and frequency spectrum histogramSound calibration TL6020/6020A sound level calibrator ...