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I think a great column would be to elaborate on the instruments that allow one to detect formaldehyde, radioactive isotopes, toxins from household cleaners, heavy metals, and asbestos. Lots of people have theory’s but haven’t invested in the instruments to provide proof.
To start with I use Soeks 5 in 1. EcoVisor. It is an F4 EMF meter, Geiger Counter. Dosimeter and water and nitrate tester. I researched and decided to use this one. It costs around $200.