As an HI, I don't offer mold inspections to anyone, but on every home inspection I do, I'm constantly on the lookout for water/moisture intrusion issues and suspected mold growth. My tools are my nose and eyes, and that has served me very well.
I find suspected mold growth on the majority of my inspections. It's almost always found within the indoor section of the AC system, where such system is within the conditioned spaces of the house. Most discoveries of suspected mold growth result in a recommendation to 'grab a bottle of Tilex and wipe it off'.
I keep a variety of equipment on hand, commonly used by others for ancillary services, to deploy whenever called for by the home inspection. I don't 'milk the cow' that has hired me to complete a home inspection.
Google Curvularia spores. They're common in the atmosphere and tend to be especially important members of the air spora in tropical areas. They poses no known threat to humans, yet are assumed to be allergenic, like all species of mold spores.