In fact, it is easy to judge which kind of ghost it is. Now these can be divided into several categories:
1. Direct category: There is water on the ground, you can see shadows in the mirror, or turn off the lights and power supply frequently (may be shy)
2. Tool category: Negative temperature (when a ghost passes through the temperature, the temperature will change, and the temperature will become lower if the lights are turned on), ghost box.
These are just a way to judge. For me, I would choose to bring ghost box, UV, EMF, and then have my assistant bring a thermometer, and turn off the light and use the ghost mode of the phone to detect if there are floating light balls, so that I can quickly know the ghost room and know which ghost it is.