I have a question for the physicists and engineers in the audience:

Let's say a metal detector for food manufacturing setting has a sensitivity, as they purport, capable of detecting a 0.6 mm diameter ferrous metal object.

I understand the metal detectors work by disturbing of the magnetic field of the test area, which generates a small voltage.

What I would like to know is what is the relationship between the mass of the ferrous object and its magnetic field? Assuming the object is 0.6 mm diameter Fe ball, how are its magnetic properties quantified?

Pls no bully, im a chemfag and not the best at physics