Check the listing for details. Brownlee precision model 440 Instrumentation Amplifier - excellent condition STD. Condition: Used. Listed at 3895.00 USD. Brownlee precision model 440 Instrumentation Amplifier - excellent condition. Standard options Includes power cord model 440The Brownlee Precision Model 440 incorporates four channels of sophisticated amplifier and filter circuitry in a friendly, easy to use instrument. Each channel consists of a high gain/low noise voltage amplifier, an 8-pole Bessel lowpass filter, a highpass filter, a line notch filter, and an output offset control. A control knob sets the amplifier parameters and the values are displayed on a bright LED alphanumeric readout. Features:Clear front panel controls for all settingsGains from 0.1 to 10,000 in fine, calibrated stepsSingle-ended or differential inputs8-pole Bessel lowpass filter with range 20 Hz to 50 kHzHighpass filter with frequency range .01 Hz to 1 kHzOutput offset control to shift output up to +/- 10 VoltsAuto-Zero feature to reset the output to the baseline levelNotch filter to suppress line noiseDigital voltmeter on channels 1 and 2Memories to hold multiple setupsLow noise circuitrySelf-trimming feature to remove internal offsetsPowerful output circuit which can directly drive transducersWide bandwidth: greater than 200 kHz on all gains Good working conditon