This is a non-contact infrared thermometer. Not the best for ghost hunting. People tend to use things that entertainment ghost hunters use on TV.. This thermometer measures surface temperature only. So if you are pointing it at the wall only way you are going to detect a significant difference is something passed in front of the beam. So it doesn't cover a whole lot of area. This tool is great though for checking drafty windows that might be causing false positive cold spots for you.
A Ghost Hunting laser IR digital thermometer is a vital piece of equipment for paranormal investigation as it locates with laser-beam accuracy temperature changes around you that could indicate the presence of ghostly activity.