Plain English Meaning
A small gauge in the cockpit that shows how warm or cold it is inside the carburetor, so the pilot can tell when ice might form there and whether the carburetor heat is working.
Full Definition
A cockpit instrument that displays the temperature of the air and fuel mixture inside the carburetor, allowing the pilot to detect conditions where carburetor ice is likely to form and to verify the effect of applying carburetor heat.
Context Anchor
Seen on some aircraft with engines, especially when discussing carburetor heat and .