Scientific microwave offers frequency meters such as: Direct Reading Frequency Meter (DRF) It is constructed from a cylindrical cavity resonator with a variable short circuit termination. The shorting plunger is used to change the resonance frequency of the cavity by changin... 

These frequency meters are intended for moderate accuracy application in microwave measurements and are usually best for this purpose. These permit full power flow down the transmission line except at the tuned frequency. It consists of a cavity, plunger and the section of s... 

Model SX-14000ExperimentsStudy of reflex Klystron tubeFrequency and guide wavelength MeasurementVSWR MeasurementImpedance MeasurementModel SX-14001ExperimentsStudy of Gunn oscillatorFrequency and guide wavelength MeasurementVSWR MeasurementImpedance MeasurementModel SX-14002...