I was concerned that the discoloration of the wallpaper in the bedroom could be due to mould. I ordered three sets even though the company only recommends two. I wanted to be doubly sure so I placed 2 in the bedroom and 1 outside as controls as instructed. Both internal kits showed about the same mold growth, so I believe these results are accurate. I then compared both inner sets to the outer control set and saw similar shapes and the same quantity. There is always mold, both inside and outside. Based on these results, I've decided that I don't have a mold problem. Nevertheless, to be sure that the mold present was not harmful, I paid the required amount and sent an internal sample to the company for analysis. They responded in a timely manner and identified the mold strains present, the extent of the mold presence and the fact that they were among the most common strains and mostly harmless. I am happy with this purchase
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