The pop diva got aides to buy the specialist kit, including electro-magnetic field readers, before her Monster's Ball tour gig at London's O2 arena tonight.
She told them she was terrified of 'bad energy' - and ordered them to do a spirit-seeking sweep of the backstage area. Her request came to light after an aide phoned Dan Webb's ghost-busting firm.
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He said: "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.
"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."