Way back in 2013 we purchased an infrared thermometer from Harbor Freight for less than ten bucks.
All in all the unit performed fine other than the plastic case getting that sticky melting feel that many low cost plastic products can develop over time.
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.