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Thermocouples measure temperature as the tiny electrical potential generated by two dissimilar conductors joined at one point (the 'couple'). They are cheap, easily made, and can be very thin, but since their operating voltages are small, they require excellent amplifiers with internal reference temperatures called 'cold junction compensators.' For best reliability, you should check any thermocouple used for critical measurements against a thermometer known to be accurate (such as an NIST-calibrated mercury thermometer) over the range of temperatures you are interested in. The types of thermocouples that can be read by DataTakers and the ADAM 4019 are:
Type T (copper-constantan)
Type J (iron-constantan)
Type K (chromel-alumel)
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