The F503ME economy 50 ohm N-type coaxial mechanical calibration kit include termination loads, open circuits, short circuits, and through adapters, specified from DC to 4.5 GHz. The F503 series performance specifications are very similar to the Keysight 85032B/E mechanical calibration kit and it can be used as an approximate replacement of 85032B/E, or use the STD of 85032B/E in network analyzers.