Check the listing for details. Krohn-Hite 3343 Dual Channel .01Hz-99.9kHz 48dB Variable Filter - Read. Condition: For parts or not working. Listed at 399.99 USD. Krohn-Hite 3343 Dual Channel .01Hz-99.9kHz 48dB Variable Filter I believe it needs some maintenance work. 1st picture: Low Pass RC Function (no overshoot). Filters not in series 20db gain.2nd picture: Low Pass Mac Flat Function (overshoot) Filters not in series 20db gain.3rd picture: Left filter low pass, right filter high pass. Filters in series @300 Hz and 20db gain. Function generator @ 300Hz.4th picture: Left filter low pass, right filter high pass. Filters in series @300 Hz and 20db gain. Function generator @ 200Hz. Signal amplitude is being reduced by the filter.5th picture: Left filter low pass, right filter high pass. Filters in series @300 Hz and 20db gain. Function generator @ 400Hz. Signal amplitude is being reduced by the filter.6th picture: Filters not in series 0db gain...no noise.7th picture: Filters not in series 0db gain...noise.8th picture: Filters not in series 0db gain... little noise. The right side filter GAIN knob is a little flaky. Sometimes when it set to 0db, it's still outputting a gain of 20db. Need to jiggle it a bit to get it to stay in 0db. No power cord, function generator, oscilloscope or cables included.