Sometimes our inspectors are requested to carry out invasive inspections to determine the presence or extent of termite damage behind walls.
Using a borescope is less destructive than removing wall sheets but these inspections have their limitations.
Borescopes will show termite damage but not determine the extent of the damage.
This is one brand of Borescope, a photo of our technician inspecting termites in a wall and some video showing termites in a wall.