Recognise the limitation
Touch, colour and juices cannot provide a temperature value or reliably prove safety.
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Guide
You cannot reliably measure internal food temperature without a thermometer. Use conservative cooking guidance and replace the missing tool.

Touch, colour and juices cannot provide a temperature value or reliably prove safety.
Follow validated time-and-method guidance, cut open only as a secondary cue, and obtain a food thermometer as soon as possible.
You cannot measure it accurately. Avoid serving high-risk food when safety is uncertain.
A meat probe is not an oven-air instrument unless the maker provides an ambient probe or permits that use.
Insert the sensing area into the thickest part, away from bone and the cooking surface.
Common questions
Follow validated time-and-method guidance, cut open only as a secondary cue, and obtain a food thermometer as soon as possible.
You cannot measure it accurately. Avoid serving high-risk food when safety is uncertain.
A meat probe is not an oven-air instrument unless the maker provides an ambient probe or permits that use.
Insert the sensing area into the thickest part, away from bone and the cooking surface.