Easy to use and eases your concerns if you suspect house mold---and shows "negative" good results! We had a moldy patch near our indoor air conditioner === it wasn't bad mold, just dirty dirt from moisture in the air ducts. However, I took the test to my place of work and sampled some fuzzy mold near the air conditioning vent next to our cabin and IT WAS "positive" for black mold! Now environmentalists are cleaning all air conditioning vents and filters.
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