Tekpower TP3645A Programmable Variable DC Power Supply 36V / 3A with USB Connection With Software CD and Mountable Rack Easy to use with numerical keypad with direct input and rotary knob adjustment Constant voltage & constant current mode 0-36 Volts and 0-3 Amps 10 parameters storage Power MS Power Management System software, ActiveX and DLL tools, Support VB, VC++, DELPHI, LABVIEW