Traceable calibration needs to be done before the FIRST significant measurement is attempted. Otherwise you have little assurance of a way to reproduce results. Recommended reading is Traceable Temperatures, 2d Ed by Nicholas & White (Wiley 2001). It's much more about measurement reliability than it is about temperature measurement.
Replay available now: A handful of emerging network technologies are competing to be the preferred wide-area connection for the Internet of Things. All claim lower costs and power use than cellular but none have wide deployment yet. Listen in as proponents of leading contenders make their case to be the metro or national IoT network of the future. Rick Merritt, EE Times Silicon Valley Bureau Chief, moderators this discussion. Join in and ask his guests questions.