Thats my problem, Don't have a $20.00 one just a Mac tools one and that doesn't tell you whats overheating or what temps on what are acceptabletry a 20 dollar infrared thermometer
The laser temp reader is just that Actual temp. Do a search for normal temps for your engine, then use your expensive Mac, You might consider getting one from the Snap On truck and do a comparison for accuracy.Thats my problem, Don't have a $20.00 one just a Mac tools one and that doesn't tell you whats overheating or what temps on what are acceptable