soojuslik mõõtevahend, milles vool kuumutab ühte või mitut termopaari ja mille(de) elektromotoorset jõudu mõõdetakse, measuring instrument which uses the thermocouple for the measurement of the temperature, current and voltage such type of instrument is known as the thermocouple instrument, thermal instrument making use of the e.m.f. of one or more thermocouples heated bu the current to be measured