>>14213484Thanks for your answer!
I just search for an ordinary way to check a stuff used by other unfamiliar people.
I have old stuff and want to know if it safe (as much as it can be checked).
I don't know anything about previous owners of this stuff.
I know - you can check radiation with a digital camera.
https://www.youtube.com/watch?v=OYvuYq5XMAgWhat about other possible bad things? Mercury evaporation (maybe someone dropped mercury inside this stuff), maybe something else...
I know - here is a lot of people have some old stuff they got from ebay and other second hand markets.
How would you check such old stuff for bad things?