Here are top quality 200a hall effect current sensors that we recovered from industrial grade battery packs. If you look around these are very expensive elsewhere online and we have them here for much less. These are guaranteed to work. Please refer to the data sheets in the 2nd, 3rd, and 4th photo for technical advice. We don't know anything more about the sensors other than they were removed from fully functioning battery packs. The wiring hardness is included and it is a 4 wire harness.