FLIR ONE for Android is a

thermal imaging camera

that attaches to your Android smartphone or tablet. It allows you to see the world in infrared, revealing temperature differences as different colors on your screen. This means you can see heat signatures, which has a variety of applications, including :

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Home inspection:

Finding drafts, electrical problems, or plumbing leaks.
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Automotive diagnostics:

Identifying overheating components.
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Outdoor activities:

Spotting wildlife at night or finding lost objects.
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DIY projects:

Checking for insulation problems or detecting heat buildup in electronics.
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General troubleshooting:

Locating sources of heat or cold.

Essentially, it turns your phone into a versatile thermal imager, providing a convenient and relatively affordable way to access this technology. Different models offer varying features and resolutions.