I saw someone use this bouncy thing once that I thought was pretty interesting, of course I have no idea what it's called - other than a bouncy thing... it's sort of like a rod with a spring that, well, bounces
It may be an aurameter...possibly! They are simple to make- you take a short length of dowel for a handle, wrap it with thick copper wire which then extends out & is given a 90 degree kink, at the end of this you wrap a quartz crystal. This device oscillates when you make contact with auric fields...might work for ghost hunting too.