Fluke 80tk thermocouple module type k fluke fluke 80tk the fluke 80tk is a thermocouple converter for use with any k type thermocouple and a digital multimeter the 80tk accepts the output of any k type thermocouple and converts it to 1 millivolt per degree celsius or fahrenheit a three position switch acts as a power switch as well as selecting fahrenheit or celsius scaling for the output br br in addition the off position of the power switch allows you to read the battery conditio