Hi All: I have a Bird model 4385-832 Power Analyst with matching model 4380A-488, IEEE-488 Bus Interface. Both units are in good working condition. The 4385 has been modified: The 19" rack panel has been cut down on both ends to make it easier to sit on a bench, or to use portable. Can someone tell me what the fair market value is for this unit? Thanks & 73, Woody KJ4SO