The mold inspector you hire depends on your needs.
If you are worried about whether mold may be present due to a hidden leak, you want to hire a professional with experience investigating building problems. Use a mold inspector who owns a moisture meter and an infrared camera. Infrared cameras measure temperature differences, which can be caused by water evaporating from a damp surface. Itís important to use a moisture meter to confirm the presence of dampness, though, because temperature differences in a wall or ceiling cavity, for example, can also be caused by cooler air infiltrating the cavity.
A mold inspector who owns a borescope or even a mold dog may be what you need. A mold dog has been trained to detect the odor of mold growth. A borescope can be used to check for mold growth by looking through a hole in a wall or ceiling. And you want to hire a mold inspector who can take a sample through that hole.