Bests & Worsts Reviews from Amazon

I purchased the unit to help determine TVOC issues with a new house I purchased. We told the builder to use no-VOC wall paint and very low or no-VOC paint for cabinets and trim, but they chose a high-VOC enamel for some of the cabinets (stupid) that are still off-gassing 4 months after being painted. The device works very well if you keep in mind that it has to be properly calibrated before taking measurements (read the manual). This requires 30 minutes of fresh air and using the "calibration" menu item. I don't have expensive monitoring equipment to compare this with, but I have tested several homes and it provides a good comparison. Pros: Seems to do a reasonable job of measuring relative air quality when you want to compare locations. Easy to use Cons: Battery usage is high, pretty much need to charge after 2 uses. It takes at least 5 to 10 minutes to get a stabilized reading of VOCs, and the screen shuts off before you can get stabilized reading causing a 3 minute wait to get another reading.