I now use the ADT7420 for human skin temperature measurement, we checked the peripheral circuits, software etc. At room temperature (20~40 degrees), through the air contact, we compared the ADT7420 temperature and mercury thermometer had little difference (<0.5 degrees).
However, we put ADT7420 in the armpit test, the value always below 34 degrees, will not reach 36 degrees, the test of our time more than 10 minutes. The mercury thermometer can reach 36 degrees.
Does ADT7420/7320 can real be use for measuring the temperature of human body?