6 March 2022, 17:33
(6 March 2022, 16:26)Pete Grey Wrote: I bought some when Chernobyl kicked off, don’t know if they are still ok, will have to check dates.
I am very sorry but not an expert on this. I do not know if they 'go off' as such. Perhaps they lose effectiveness over time? The last thing I want to do is make Jeff Bozo even more rich but maybe there is a source that is local to you? Might be worth a quick enquiry.
Again I hope none of us should ever need such a thing.