Moisture detectors/meters

Hi, any suggestions on which moisture detector to use for both shingle and flat roofs? I have been doing some researching and have yet found one that works on both. The Protimeter Surveymaster is suggested but does it do the job for both. Also, the Tramex moisture meters (hand held).

I do both shingle and flat roofs and don’t want to buy two meters to get the job done.

Any Suggestions!