Many grillers advise using aluminum foil to extend the life of the probes on smoker thermometers. This method helps in the protection of the cable against hot spots. Wrap only the part of the cable that is in contact with the hot area with foil. However, make sure the foil does not extend beyond the hot point. Wrapping the entire cable length in foil can direct hot air down the tube, so only use it where necessary and nowhere else.