Short ground needle accessory on naked nose probe helps picking less interference than with probe's neck ground return crock wire. Due to much less inductance and narrow loop area very near to nose pin.
Yes I get quite different results on my kitchen table just by placing things different. I need to get my little lab bench in order, but it is serving as some kind of junkyard storage right now 
It is double isolated with grounded metal. It makes quite a difference. Also only uses led lights with transformers on a distance etc.
I was perplexed when I saw the line changing quite a bit in thickness for example weather I had the ac plug in the tx box plugged or not, even with the switch off. So line or neutral, not both was in connection with tx primary, that was the only thing.
Projects pile up… well as long as it is fun
It is double isolated with grounded metal. It makes quite a difference. Also only uses led lights with transformers on a distance etc.
I was perplexed when I saw the line changing quite a bit in thickness for example weather I had the ac plug in the tx box plugged or not, even with the switch off. So line or neutral, not both was in connection with tx primary, that was the only thing.
Projects pile up… well as long as it is fun
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I have tried making those with mixed results long ago, they never comes with the probes I have acquired so far
Noise enters a loop from everywhere including protective earth. A clever check you did was DUT off. If the noise is still there its from the test set up. Also easy is to flip the Schuko exchanging live and neutral and see if noise changes.
Was in cheapo probes bags along with color rings. Maybe when they were included with economic scopes though.
It is very convenient to work with, decent auto setup to quickly find results and just to take the laptop and scope to where you are also makes it slick. Plus the good generator as you say. As long as there is no high voltage or many MHz or GHz oscillations to look for it does the job very well. I have bigger ones as well but this is used 9 out of 10 times. Handy for online discussions also. Just save to png, no shaky photos of phosfor screens etc