Instek GPD-3303S 195W Triple-Output Programmable Linear DC Power Supply, 30V DC, 3 Amp, 1mV, 1-milliamp Resolution Linear power supply unit provides a constant source of DC voltage and for powering and testing electronic devices Two outputs supply adjustable voltage up to 30VDC and current up to 3 amp Third output supplies fixed voltage of 2.5V, 3.3V, or 5VDC and current of 3 amp Digitally controlled knobs for fine and coarse adjustment of voltage and current output 1mV/1mA resolution for observing the device under test's response to small changes in voltage and current