Gaorgas 100-240V Gold Metal Scanner Detection Finder - 1000M Range

This product feels like a replica one. There was no AKS authenticity card with it...i have used like this original product before..its suppose to revolve when held above gold ..but this one doesn't...it randomly moves here and there...points in many direction.......built quality and packing is good, it beeps when probe touches gold but .....main function of pointing towards gold and revolving when held above gold is not working