Hunting Case

What can I do to protect myself or friends from being attacked by ghosts or demonic beings while ghost hunting?
Please don't come up with some dumb idea, I want really know if there are such objects or things to use. In order to be protected in case of encounter with the paranormal. what are good things to bring during a ghost hunt, and what things to do, so I don't piss off these ghost.
I'm a Paranormal Investigator. This is what you need to do:
Before you start, pray to Michael the Arch Angel to keep you safe and protected.
Carry sea salt in a little bag in your pocket, sea salt protects from evil.
Don't provoke, that will piss off some entities.
Tell them you are not there to harm them, you are just there for research purposes.
When you get home- take a bath, poor the sea salt in the bath tub and soak in it. In case anything attached itself to you, you will be protected.
Dead Rising 2: Case West: Zombie Hunter Achievement Guide.