Which of the following is a tool specifically associated with heating methamphetamine?

The use of butane torches is specifically associated with heating methamphetamine because they provide a concentrated, high-temperature flame. This high heat can effectively vaporize the drug for methods of consumption, such as smoking. Butane torches are commonly utilized in the drug culture due to their portability and ability to produce a consistent, controlled flame, making them ideal for heating substances like methamphetamine.

Other tools mentioned, while they may have various uses, are not primarily associated with the heating of methamphetamine. Mirrors are often used as surfaces for reflecting or viewing, foil can be utilized in drug consumption methods but lacks the direct heating capability of torches, and push rods are more related to the manipulation of material rather than the direct heating process. Each of these items serves a different purpose and does not specifically facilitate the heating needed in the methamphetamine process like butane torches do.