Tube Type Radiation Detectors
Tube type, inexpensive detectors can only detect things like extremely high radiation fallout from something like a nuclear accident. They absolutely cannot be used to test things like foods or drinks, for low level radiation contamination. They are extremely insensitive and can only warn a person much like a smoke detector, when there is an extreme radiation emergency happening, but just about nothing else.
INEXPENSIVE TUBE TYPE RADIATION DETECTORS ALL HAVE THIS 'TUBE' INSIDE OF THEM, WHICH SERVES AS THE DETECTOR, IT IS VERY INSENSITIVE
The SOEKS is a tube type, inexpensive radiation detector which is designed to detect things like extremely high radiation fallout from a nuclear accident, but not much else. A tube type detector use something like this to detect radiation.
Don't try to use this tube type of detector for testing food, as it will not do the job. It is a good radiation meter to start with for beginners at an affordable cost, but it will only warn a person in case of severe radiation emergency, and should not be used for anything else.