Temperature indicator device
Temperature indicator device (TID). A precalibrated temperature-measuring instrument containing a chemical compound activated at a specific temperature (the melting point of the chemical compound) identical to the processing temperature that must be reached by the meat being cooked. The Administrator will approve a TID for use after determining that the chemical compound in the device is activated at the specific temperature required.
9 CFR § 94.0
As used in this part, the following terms shall have the meanings set forth in this section.