Calibrated Topward Electric Instruments TPS-4000 Dual Tracking DC Power Supply in very good condition (see photo).
The Topward Model TPS-4000 is a bench top triple-output power supply. Voltage outputs may be electrically connected tracking. The two main power supplies in the TPS-4000 have meters monitoring output voltage and current. Each of the power supplies is also equipped with independent controls for use when the unit is not being operated in the tracking mode. The remaining power supply has a fixed 5 volt 3 amp. output.