Found this. What could it be? So many resistors and nothing else?
EDIT: Sorry wrong forum, could someone move this to Electrical Engineering?
Thread moved. I agree with @davenn -- show us the other side of the PCBA.and what is on the other side of the board ?, probably lots of other components ??
I took the pictures myself. I found the board in a high school physics collection, in a drawer with other random boards, probably just to show the students examples of printed circuits. There was no further information and nobody knew who originally put it there.