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Walkie-talkies or two-way radios are a good way for investigators to keep in touch with one another during an investigation. If you are contemplating splitting up into groups, or even going off individually whilst investigating a location, it is always a good idea to be able to contact your fellow investigators.

A Thermometer

A thermometer is a must in order to detect fluctuations in the temperature of a room. I have seen large green-house-type thermometers used, but of course the serious ghost hunter will invest in a digital thermometer which gives the exact temperature on an ‘easy to read’ digital display.