In my quest, the signals I am looking at are 4Ghz and up. I need to design for a specific SMPTE specification so I would be nervous about trying to save money buying anything other than calibrated Keysight probes. The cost of bad measurments is much higher than the cost of buying the guaranteed probes in the first place. There is some sticker shock, but I did get the first $50k for free by way of the scope itself.
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