Our TCA-BTA thermocouples use type-K thermocouple wire. We sell a replacement wire for use on our newer thermocouple as Type-K Thermocouple Wire, order code KWIRE-TCA, $11.
Note that this is only for our newer, "cold junction compensated" thermocouples. These newer thermocouple units have slots labelled "+" and "-" on one end of the box, where a connector with the thermocouple wire attached plugs in. The KWIRE-TCA replacement wire connects there.
Older Vernier thermocouples have two banana plugs on them and thermocouple wire attaches to the banana plugs. Part number KWIRE-TCA will not work on these older thermocouples. Contact us if you need replacement wire for these older devices.