... , fan cover, horologe screwdriver, briefcase Modal TL6288BMeasuring range A sound level:30-135dB C sound level:35-135dBLinearity: 40-135dBFrequency range20Hz-12 ... ,24h,regularAutomatic measuring functionLeq,L5,L10.L50,L90,Lmax,SD,Ld,Ln,Ldn,1/1 frequency spectrumFilter characteristics1/1 frequency intervalcentre ...