Gaga had her aides order in the specialist equipment which measures electromagnetic fields to test for supernatural activity.
Ghostbusting firm owner Dan Webb tells the Sunday Mirror, "When I took the order for the kit I had no idea who it was for. But then I checked the listings and saw who was playing the O2."
He adds, "Her aide said the gear had to be robust as they were taking it on the road. So they must be doing this everywhere Lady Gaga is performing."