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Thermometers are an instrument that is also very useful There are two types used:
regular digital thermometers and infrared non contact thermometers. When used on an investigation this will aid as a
detection system for spirit presence. Rapid temperature drop of 10 degrees or more could indicate spirit presence.
I recommend using the infrared non contact thermometers because they react in less than a second to a temperature drop and
you can scan a large area quickly. (Troy Taylor)
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