WAVETEK 852 DUAL HI LO FILTER110V/220V30만원010-3321-54사2Two identical filter channels High pass and low pass functions 3-digit resolution for cutoff frequency selection 0.1 Hz to 111 kHz frequency 48 dB/octave attenuation slope 0 dB or 20 dB gain Butterworth or Flat Delay response ±2% cutoff frequency accuracy 90 dB dynamic range