Which of the following thermocouple is capable of measuring highest temperature?
- A. Chromel - alumel
- B. Platinum - rhodium
- C. Iridium - rhodium
- D. Iron - constantan
Answer: C. Iridium - rhodium
Explanation: Iridium-Rhodium thermocouples can measure up to ~2000°C, higher than Pt-Rh.