This auction is for a Tektronix TLA 7N4 136-Channel Logic Analyzer Module with Option 2S (s/n B010410; 2GHz Timing / 200MHz State /1M Depth; Firmware Version 4.3), as shown. It is in good working condition, and it comes with a Calibration Certificate (Calibration Date: Aug 8, 2008; In Service Date: Feb 17, 2009, Calibration Due Date: Feb 17, 2010). Please see the last photo below for a complete list of accessories included.