The 13-4615-10 DC Amplifier Plug-in is a balanced to common medium gain signal conditioner designed for use with Gould 2000-series recorders. This single channel amplifier module provides an input range from 25 mV to 500 V full scale. Frequency response is less than 3 dB down at 2kHz with filter off; flat to ?0.5% from dc to 100Hz with filter off. Includes front-panel balance adjustment, zero suppression vernier and 5/15Hz filters. Price for amplifier only.