This was to locate lines before the contractor had to dig.

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John Cannamela
ASNT II Vibration/ Level II Thermographer
HVAC Journeyman
Owner
http://www.infraredsurvey.com

Here is one that was Electrical Infloor heat with a bad connection in the factory wiring.

Have a good Day

Regards

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Jeremy Kays Reliability Technician
Level II IR, MCA / UE Level I, In Compliance with the ASNT guidelines
X-Ray Eyes