My takeaway, R&S was limited to 25MHz min, 120W Avg.
At 2:24, it states the sensor can be used with the NRT2 meter or a PC with the virtual NRT PC software. It shows the connector but never talks about how this would connect to the PC. I would have guessed the PC connects to the NRT2 and requires it to talk with the sensor. But that is not what the video claims.
CBers and hams need to yell "audio" into the mic and watch the meters live. There was no mention how fast the bar graphs are updated. The Bird 43 is fast enough for both groups. We saw that one with the PC interface running at 1Hz and the ham/CBer was pretty upset how useless it was. I would think something basic like the update rate would be one of the first things mentioned and demonstrated in a video like this. I didn't see a mention of minimum power or accuracy.
The homemade one I demonstrated had maybe a 2kHz update rate. I would need to go back and look. I think I demonstrated it with signal levels as low as -30dBm. Downside to that unit was my home made coupler was limited to about 50MHz. I could have possibly characterized it and then compensated for the non linearity in software but as it was, I just used a simple point slope and called it a day. There was a third or fourth order polynomial fit to that Bird 43 analog meter graphics I ripped off. Far more math to get that to work. 
"Fuuunnnyyy thhiiinng", I have never yelled "Auuuddddiiiooo" into a microphone in my life, nor heard a ham, CBer, or anyone else do so, except the CB "Gurus" on Youtube, who seem to delight in it
The usual test is to check the power on CW, then switch to SSB & say, if on a test load, "Testing, testing, 1, 2, 3".
On an antenna, a short burst of CW, followed by (in my case) "VK6ZGO Testing" or, if I expected someone to answer me, "CQ Test, CQ test this is VK6ZGO calling & testing."
Of course, a real test of an SSB transmitter ideally requires a two tone generator, even more ideally with a spectrum analyser as the device to look at the output.
Back in the "bad old days" at my old work, we tested our ISB comms Tx with a two tone generator & a selective voltmeter built into the exciter unit, to check intermods & channel to channel crosstalk.
For actual output power the Transmitters also had some quite good meters built in, which would show PEP.
Hell, that was so long ago that the exciters used Musa coax connectors!!
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