Tekpower TP3646A Programmable & Variable High-Precision DC Power Supply 0-72V @ 0-1.5A with USB Connection Numerical keypad with direct input and rotary knob adjustment Constant voltage & constant current mode Low output ripple & noise Power MS Power Management System software, ActiveX and DLL tools, Support VB, VC++, DELPHI, LABVIEW One year warranty with cablibration certificate