Many paranormal researchers believe significant deviations from ambient environmental measurements, on a variety of high-tech, handheld meter devices, may indicate the presence of paranormal activity, or, especially, movement thereof. Michigan Paranormal Advisers add these devices to their quiver, not as a sole means of proving / disproving activity, but rather as additional tools.
Primarily, meters, which can very accurately measure:
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EMF Meter for Electromagnetic Fields / measured in Gauss
Theory: Ghosts, or similar entities, can manipulate existing electromagnetic fields to manifest themselves.
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Thermometer for Temperature - Both Ambient and Infrared ('Pinpoint') / measured in Degrees, both Fahrenheit and Celsius
Theory: To make their presences known, ghosts, or similar entities, can draw thermal energy from the environment, making the temperature in certain areas much colder than others - a phenomena known as 'cold spots'.
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Ionization / measured Joules
The discharge of electrons from a fast-moving electric current colliding with a gaseous element. Theory: also manipulable and may detect significant, yet otherwise naturally unexplain-able abnormalities.
and more.