One of the finest Signal Analyzers for audio available today. Self-Test diagnostic testing features insures 100% working condition. .005Hz-100 KHz Freq. Range Channel 1, 0.01 Hz to 50 KHz Channel 2 ZOOM (looking at a portion of the entire range) GPIB (IEEE STD 488) Tracking Signal Generator Transient Capture Analog & Digital Plot Out Autoranging External Sampling Simultaneous TIME/ FREQUENCY display Log Frequency Scale Full & Split Screen Disp. Time Averaging Edited Transfer Function Multiple cursors Force Window 115/230 vac 50/60 Hz