Measuring Microwave Frequency with CRO

The freq of microwave which we use in our practical lab is of 8-12ghz. but how could we observe it in a 300mhz cro?

Use a frequency divider circuit:
https://www.ecelab.com/circuit-frequency-divider.htm

where do we hav that frequency divider ckt in cro??

I thought that you wanted to know how a 300 MHz scope could be used to observe 8-12ghz. I f you are already able to see it on the existing scope, I have no answer. Which model scope is this? Generally a 300MHz scope's maximum frequency will be that and it cannot be used at higher frequencies.