Here we have a FLIR adapter for an iPhone 11.

  FLIR stands for Forward Looking Infrared, and is basically    a camera that detects heat   (infrared energy) and                  converts it into a visual image.                                                                                                                                                                          That being the case, a FLIR device can show us                          temperature variations in a much more specific way than    a digital or laser thermometer.                                                                                           
  It records either video or still images as seen to the left
  (this image is GBPA Investigator Eva Nagy in the                      Wardroom Galley of USS Salem).

  

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