A T-type thermocouple
probe was constructed [using 40 fine gauge (0.2mm wire diameter,
Class 1 Tolerance; calibrated against an RT200 reference thermometer)]
for each of the 6 samples using a 14 gaugeMonoject™hypodermic needle.
The thermocouple tip was insulated to prevent heat transfer from
the metal of the needle. The thermocouple sensors were fixed into the
lid such that it would always be located in the physical centre of the
product sample when the rig was assembled.