Check the thermometer's upper limit
Read the product manual before heating the oil. The entire target range must sit inside the maker's published operating range; never assume a meat-labelled probe tolerates deep-frying heat.
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Guide
Yes—provided the manufacturer rates the probe for the oil temperature you need and you keep the sensing area submerged without touching the pot. Many leave-in meat probes are not designed for this job.
Read the product manual before heating the oil. The entire target range must sit inside the maker's published operating range; never assume a meat-labelled probe tolerates deep-frying heat.
Some probes tolerate high temperatures while their cable, plastic housing or display does not. Keep the handle, cable junction and electronics away from hot oil unless the instructions explicitly permit immersion.
Immerse the sensing section far enough to obtain a stable reading, but do not let it touch the base or side of the pot. Contact with metal can report the cookware temperature rather than the oil.
Heat gradually as the oil approaches the recipe target. Residual heat can carry the temperature upward after the burner is reduced, particularly in a heavy pot.
Let the probe cool, then clean it as directed by the manufacturer. Do not submerge a display or connector that is not rated as waterproof.
Common questions
No. Use one only when its stated range and immersion instructions cover the intended oil temperature.
Only if the manufacturer identifies it as leave-in and rates the probe, cable and intended immersion depth for that use.
Metal contact can make the reading reflect the pot rather than the oil and may expose the probe to a hotter surface.
A clip-on candy or deep-fry thermometer is usually easier to position for continuous oil monitoring because it is designed for the task.