HP 8920A with options 001( high stability reference), 002 (spectrum analyzer / tracking generator), 003 (rear rs-232 and GPIB ports), 004 (audio signaling -encoder / decoder), 005 (additional memory), 013 (C-MESSAGE audio filter), Nice condition but has no handle or front cover. This unit has been refurbished meaning that wear parts including electrolytic capacitors in the power supply have been replaced. It's calibrated with full performance evaluation data and includes a 180 day warranty. To inquire, call (716-763-9104) Amtronix Instruments or email amtronix