Use instruments suitable for each temperature range and environment. A thermometer intended only for refrigerated conditions may not measure the freezer reliably.
What the observation tells you
Placement and response time also need consistency. Comparing a fridge sensor against a freezer target is meaningless, and a cable trapped across a door seal can change the conditions being measured. The controls may show targets rather than live readings.
A useful next step
Follow the instrument and appliance instructions, label the readings by compartment and record placement. If results are implausible, verify the instrument while continuing to protect vulnerable food.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.