The small dimension of the NV and dielectric nature of diamond make the NV an ideal non-invasive probe for microwave fields. No capacitve coupling and high resolution make it especially useful for miniaturized electronics. With Quantum Lock-in techniques you can separate out specific frequencies. Verify simulations, whether for RF systems-on-chip or ion traps for quantum computing.

You can also map signals in time rather than space. Reconstruct the temporal shape of an arbitrary, replayable signal with several 10 MHz of bandwidth. Or check arrival times with much higher time resolution. This feature turns the NV into an atomic size oscilloscope, enabling you to understand impedance mismatches and the effect of reflections on your signals better.