Four ghost hunting tools in one handy iPhone app. Brilliant. (That is, if you believe in ghosts or if you believe your iPhone is going to work compared to the scientific equipment the television ghost hunters use!)
4 apps in one
$3.99 is much cheaper than an actual piece of ghost hunting equipments
No proof that this actually works in a real ghost hunting setting
Summary: While the app looks awesome and the design (and idea) is brilliant, I am not convinced it would work. It would be a lot of fun to scare your friends!