The ARC Devices unit is silent, so there are sounds to awaken the aforementioned sleeping baby, and it’s the most accurate of all of the non-contact thermometers on this list. The manufacturer says that this model is accurate to within +/- 0.4°F (it can be switched to Celsius mode as well, in which it’s accurate to within +/- 0.2°), and tests show that’s pretty much on the money.