How to know it there a current is flowing... by Gabriel Caffese .

Hello, I need to know if a small current, that falls between 0.2ma and 3ma, flows over a pair of copper wires of printed circuit boards. Those printed circuit boards cannot be touched, and I cannot insert any standard measurement equipment, because there is no available space as to do that. The only way (I think) , is to use something like a Hall effect transistor, wich can be hardly put (but can at last), below the printed circuit boards that are being inserted. So, I would like to know if someone has ever done something like this before, and, if I am on the right way, and this can be done. Hope to receive news from you !!!!