DallasBill,

The Amazon advertisement says

I take that as meaning that if you're 2 feet from the wall, you read a 1 foot wide area, i.e, a 45 degree angle.  If you're 28 feet from the ceiling, you'll get a picture of a 14 foot wide area, not just the peak.

At $45, I recommend these Infrared thermometers to anybody that really wants to know what's going on with their furnace duct temps, window efficiency, stud R value, you name it.  The first time I saw one of these, it was at a vintage sports car race (all Volvo 1800s).  The guy next to me was using it on his tires after the qualifying laps to check the heat across the tread and determine the proper tire pressure for the course.  If an area of the tire is cooller, the tire is lifting up or one side of the tread is lifting off the track.  He was the only guy that beat my time.  Neat tool.  He still beats me.

Mark

Very "cool" about the tires, Mark!

That is a misprint -- the '1' is missing.  Further down in the details it says (and it's in the product package, too):
"12 to 1 ratio - increased distance to spot ratio."