As a doctor and most importantly as a parent of two children I will tell you this: these types of devices don't work. You measure five different times and you will get 5 different readings.
You say this, but every doctor's office, and hospital I have been in over the last 5 years or so have used non-contact thermometers to check temperature. Including my doctor appointment last week and at the hospital for the birth of my second child last month.
I agree that many of the cheap ones sold at Walmart and Toys R Us aren't very accurate, but I don't believe they are FDA approved.
Contactless:
Shows thermostat rammed against baby's head.
I believe the contactless is talking about the actual temperature sensor. The sensor is recessed inside the housing so it does not contact the skin, so it doesn't need to be cleaned/disinfected etc. and should stay working longer. The housing does contact the skin so it can help keep a set distance between the skin and sensor to keep readings more accurate.