... screwdriver, briefcase Modal TL6288BMeasuring range A sound level:30-135dB C sound level:35-135dBLinearity: 40-135dBFrequency range20Hz ... and frequency spectrum histogramSound calibration TL6020/6020A sound level calibrator Sound level: 94dB, 1kHzDisplay 54mm×42mm LCD ... digital display, analog watch handDisplay measuring mode, measuring time, clock, ...