The 64K36R-MSOS3 from Rosenberger is a VNA Calibration Kit with Frequency DC to 6 GHz, Max Input Power 1 W, Operating Temperature 0 to 50 Degree C, Return Loss 38 to 40 dB, Storage temperature -55 to 90 Degree C. Tags: Passive Calibration Kit. More details for 64K36R-MSOS3 can be seen below.