Yeah, don't follow my example when it comes to measurements.
Of course it has a metal case at ground potential and you
would get a shock.
However there's no risk of a mains - ground short or internal isolation breakdown when measuring such floating potentials as it's not running from mains.
I just hook up it up to a battery , set the desired parameters beforehand and leave it like that to pick up the waveform.
If I have to (even more rare) tweak it, then I use thick gloves that can withstand quite a lot of voltage.
"Expensive" is a relative term.
A probe like that is in fact more expensive than any of the scopes I have on my bench.
This russian scope is about the same as a new Tek standard 10X 50MHz probe, or even cheaper than that in the former USSR.
In general I do care about my own safety, made my own floating 230V source for low-power work.
But I cannot run a welder or a VFD from that, not enough power or runs off 3phase.
So in such cases I just hook up this thing.
And a lot of companies won't say "OK, you can order that 300USD probe for measuring stuff".
I work with what is available.
Most of the time I don't have to do go that far. Over 3 years I would say 5-6 times I had to go with such improvised measurement.
Looks cool! - does it run off batteries or something like that?
27V DC is one of the options, meant to be used with two 12V lead-acid in series.
I most often run it off 7 li-ion cells in series which is OK, since internally it already runs at 31V.
The other option is 115V 400Hz which is an aircraft/military supply.
Basic power source beeing the soviet bloc 220V 50Hz standard mains.
So it's more of a military-design "in the field" scope.
It even included a belt to carry it around.
And it has multimeter integrated, which is separate from the chassis ground.