The Agilent Varian 921-0062 Ion Pump Controller is designed from small 8 l/s to medium 60 l/s diode and triode sputter ion vacuum pumps. The Varian 921-0062 has external selection switches to set the correct pumping speed (8, 20, 30, or 60 l/s) and polarity ( + HV or - HV). The Varian 921-0062 has a front display meter for easy observation of the ion pump operation (pump voltage, current, and system pressure). These Varian 921-0062 ion pump controllers have been rebuilt. The controller electronics are inspected in our electronics shop (malfunctioning electronic components are replaced) and each Varian 921-0062 Ion Pump Control Unit is bench tested.