Which of the following is NOT a method of termite detection?

The method that is not typically used for termite detection is sound detection. While sound can occasionally be utilized in detecting certain structural problems, it is not an established or reliable method for identifying the presence of termites. Termites are often hidden within walls and inaccessible areas, making it difficult for sound detection techniques to accurately determine their presence.

On the other hand, moisture meters are essential tools in termite detection as they help identify areas of high moisture, which can indicate conditions conducive to termite infestations. Visual inspections are standard practice, where trained professionals examine visible signs of termites, such as mud tubes or damaged wood. Thermal imaging is also an effective method that allows for the detection of thermal discrepancies in building structures, which could indicate termite activity by revealing hidden infestations.

Thus, while the other options are recognized and effective methods for detecting termites, sound detection does not have the same level of application in termite inspection procedures.