This is a used Tektronix model FG 507 Sweep Function Generator. Requires 2 TM500 series slots. (power supply not included–see our other auctions for power supply and other TM modules). It has 30 volts p-p maximum output into a 50 ohm load. It provides log or linear sweep, manual, triggered, freerun, and hold. It has variable duration, 3 wave forms, variable DC, and + or – offset.