No, but I don't think that is exactly what Vengeance meant. I'm thinking he means maybe putting it in there inititally, it will take a little while for the reading on the thermometer to build up to the actual temperature. Like say you take your own body temperature with a digital mouth thermometer, you can watch the temperature building up and getting higher until it finally reaches the actual temperature, then it beeps. Sort of the same thing. It's not instantaneous - you don't stick the probe down and then have it instantly pick up the actual temperature, whilst with a temperature gun you would get it instantly.