Remote Ping Tester

I have a series of network connections on multiple that use copper to fiber transitions for lightning protection. We need to validate the connections before we raise the equipment. So the connections will go:

(rack) RJ45 copper <-> 225' MM fiber <-> RJ45 copper (top of tower)

Is there a small remote ethernet device I can plug into the tower end of the RJ 45 to test ping? We need to validate the entire length of the connection. Hauling up (and using) a laptop up there is not safe.

There is PoE power available on top of the mast.