Considering how common radiation sources are in Chinese gadgets (some even containing radioactive materials in loose powder form), a dosimeter or a geiger counter is mandatory safety equipment when moving house.
Specifically the bizarre pseudoscience ones, not the electrical ones used to electrostatically remove particulates from air (and sometimes add ozone into the bargain).
If anything it's impressive that the purveyors of such bracelets and other things would go to the bother of including radioactive material in the first place. They could have just put some ground quartz (i.e. sand) in it and said it was "crystals". No one was going to check, and even if they did, and you couldn't fob then off by saying their test was invalid, like the Batteriser guy tried to do, what would they do about it? Leave you a bad review on Amazon before you rebrand as Engrokoo or something and pop up as a new name?
I understand it may seem confusing. These ”energy healing devices” are a very real danger when people unknowingly order them online and their kids take them apart.
There are some amulet-like things that could be used for detector testings, they were freely available on aliexpress a few years ago. Also there are some radioactive "trithium" keychains that may contain absolutely anything but tritium.
A vastly different response than this recent accident in which they did not give up after a week: https://news.ycombinator.com/item?id=34607423