Thermocouple type

If you're not sure which wire is + or - you can check with a multimeter in mV range and holding a lighter under the tip. When you connect + and - correct the mV reading should go op.

If you're not sure which specific thermocouple type you have (type E is a type, but for example J and K are also used a lot) you can always check with a proper thermocouple calibrator.
Also the color of the connected wires can give you can indication.

For more information on this, see our website: