I purchased several LM34 temperature sensors to use with my high school engineering classes. The LM34 has a great reputation for accurate temperature measurement (+/- 0.5 degree F) and provides a voltage signal that is a linear function of the Fahrenheit temperature (10mV per degree F, 0 v = 0 degrees F). My LM34 sensors seem to read about 5 degrees F (50 mV) higher than a thermometer placed next to the breadboard. I have tested the reference voltage to the LM34 and found it to be 4.96-4.97 v. Can anyone suggest what the problem might be? Many thanks as always for your incredible support!