Jessica Youmans im a home inspector there are two different types of mold test air sample and swap. swap sample which is what you can get a any hardware store is only good if visible mold is present. air samples require a special machine which you will have to hire a professional for. Air samples are the better of the two. We perform mold test and would love to assist you we can be reached at 678-752-1913facebook.com/knightsshieldhomeinspections