Way back in 2013 we purchased an infrared thermometer from Harbor Freight for less than ten bucks.
Recently we got our hands on a 3M Model IR-750B "Scotchtrak Heat Tracer" infrared thermometer and decided to compare the two units. Right away it's obvious that the 3M Model IR-750B has a superior feel.
So..... How do their measurements compare?
Pretty close! Which unit is correct? We don't have a calibrated source so we have no way of knowing. What we do know is they produce temperature readings that are closely collaborated.