Benchtop DC Power Supply are often used in laboratory to provide continuous adjustable voltage and current. This is a CVCC (constant voltage constant current) single output power supply with floating gound which proivde either an adjustable output voltage of 0 to 30VDC or 0 to -30VDC with an adjustable output current of 0 to 3A. The voltage and current are adjusted by a fine potentiometer where both the output are accurately displayed on the volt and amp meter.