Consider measuring a signal from a 75 Ω source like a video camera. The camera is designed to work into a 75 Ω load. In order to ensure a proper impedance match between the source and the oscilloscope ...
They're called probes, and are usually rated by bandwidth (e.g. 100Mhz, 1GHz, etc). Probes are fairly common, but I wouldn't know who to recommend; knowing the term should help you get started.
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