The TP3005PIII is a high-precision, variable DC power supply. It can operate on either Constant Voltage (C. V. ) or Constant Current (C. C. ) mode. While on C. C. mode, the voltage is adjustable between 0 and 30 volts. Whereas the current is adjustable between 0 and 5 amps when on C. V. mode. Dual channels output for convenient serial or parallel setup, the 3rd output is fixed output at 5 volts.