Bests & Worsts Reviews from Amazon

This device was so helpful! Make sure you follow the directions; let the monitor offgass for the amount time the manual states before you calibrate the device in truly fresh air. Test with your windows and doors closed. Also, make sure your building has been shut up for awhile before you test, and don't test during or right after you cook something because this will cause your TVOC to read higher. If you don't follow these instructions properly, you will get inaccurate readings. This monitor proved that we were indeed having problems with high amounts of formaldehyde and high TVOC in the air inside our home, which was making us increasingly ill. Air testing with a disaster relief company we checked with would have been over $500! On a side note, the agent said their monitor looks similar to this one. After testing our air, we researched many air purifiers and settled on buying a Molekule air purifier, which proved to be a purchase we are absolutely grateful for, so we bought a second unit about a month later. Initial testing with this air quality monitor showed our numbers to be very high and in the RED, which indicated highly polluted and hazardous toxic air. Also, we had an unbearable smell that would not go away, even though we continued to try to air out the house with open windows off and on over a period of weeks. Several days after running the purifier, we tested again. This time it showed GREEN, indicating fresh air with MUCH lower levels of formaldehyde (HCHO) and Total Volatile Air Compounds (TVOC)). The horrible smell was also gone after using the Molekule! We were then able to return to our home. Don't be fooled into purchasing an indoor air quality monitor that is more expensive! This really does the job!