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.
As we unveil EE Times’ 2015 Silicon 60 list, journalist & Silicon 60 researcher Peter Clarke hosts a conversation on startups in the electronics industry. Panelists Dan Armbrust (investment firm Silicon Catalyst), Andrew Kau (venture capital firm Walden International), and Stan Boland (successful serial entrepreneur, former CEO of Neul, Icera) join in the live debate.