Check the listing for details. Tektronix PS 503A Dual Tracking Power Supply Tested PLEASE READ DESCRIPTION. Condition: Used. Listed at 130.00 USD. ONE Tektronix PS 503A Dual Tracking Power Supply Tested & Working 30 Days Warranty - You are bidding on ONE Tektronix PS 503A Dual Tracking Power Supply Tested & Working. We are displaying Mainframe with two Multimeter. This Auction is for PS 503A Dual Power Supply ONLY. The Mainframe and other module selling in a separate auctions with same pictures and video clip. We have marked with arrows what we are selling in this auction. Please review the actual pictures and the module with arrow marked. This Power module removed while working as shown in the actual pictures. We have taken many actual unit pictures for buyers to review. Please review actual pictures and a video clip for physical condition. There are minor cosmetics or blemishes. Happy Bidding!!! Pictures Pay securely with any major credit card through PayPal!/font>