Only use an instrument within its stated purpose and temperature limits. A probe intended for food is not automatically suitable as a free-standing cavity thermometer.
What the observation means
The sensing method, exposed cable and display unit can have different limits. Even a built-in oven probe may be designed to sit inside food, not measure the air around it. An unsuitable test can damage the instrument or produce misleading numbers.
A useful next step
Use existing observations in a repair enquiry and leave diagnostic temperature testing to the appropriate person. Do not route an ordinary thermometer lead through the door or place its display inside the hot cavity.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.