Gieger-counter-ology isn’t necessarily as trivial as you might want. In addition to some fleabay Gieger counters being worth even less than you pay, you have to deal with a number of different variants, each with their own specialties and limitations.
Doesn’t make the task impossible; by any means; but if some n00b with a device designed for hunting gamma and X rays declares an alpha-emitter riddled fish to be A-OK, it wouldn’t be a huge surprise.
