Always keep records of times and events.

 2,Flashlight,

 Quite handy to see in the dark ,Extra batteries are a good idea in case of battery drainage. 

 3,Motion detectors,

 These devices are good for sensing movement when there should be none

 4,Video camera,

 To allow you to capture events as they are happening.

 5,E.M.F detector,

 Disruptions in electronic fields could possibly mean ghosts.

 6,Dowsing rods,

 Some researchers feel that the use of dowsing rods can help to sense ghosts.

 7,Tape recorder,

 There is a phenomenon called EVP (electronic voice phenomenon) whereby spirit voices have been known to appear   on tape later after being reviewed.

 8,Camera,

 Very useful for capturing still photos.

 9,Thermometer,

 Rapid temperature drops have been associated with ghosts.

 10,Night vision,

 Another handy tool in a pitch black room, but can be expensive.