Safety Interface Cable for connecting the optically isolated serial interface ports of the Scope Meter or mains and power supply analyzer to a standard USB interface on your PC. Optical insulation allows potential-free measurements on mains voltages or higher voltages without separation from the PC. • Supports the Devices Fluke series 120, Fluke Scope Meter Series 190, as well as the series 43, 43 B and 430 Power Quality analyzer • Cable Length (extended): 1.5 m .