A temperature measuring device (3) comprising at least two mating contact elements (11, 12) which are configured to receive in each case one contact element (9, 10) of a plugged-in thermocouple (2), wherein a first measurement sensor (13, 14) is arranged on at least one first mating contact element (11, 12) of the at least two mating contact elements (11, 12), a magnetic property of the contact element (9, 10), which is plug-connected to the first mating contact element (11, 12), being detectable using said first measurement sensor, and the first measurement sensor (13, 14) is readable by a drive unit (15), and the drive unit (15) provides a characteristic curve or a specific item of information about the plugged-in thermocouple (2) depending on an output signal from the first measurement sensor (13, 14).