| International Thermocouple Colour Codes - Thermocouple and Extension Grade Wires | |||
| Alloy Combination | Colour Coding Extension Grade | Maximum Temperature Useful Range | |
| + Lead | - Lead | ||
|
|  | - 200 to 350°C (- 328 to 662°F) Therm. Grade - 60 to 100°C (- 76 to 212°F) Ext. Grade |
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