Review on 🌬️ Accurate Indoor Air Quality Monitoring: Extech VFM200 VOC/Formaldehyde Meter by Gary Hall

Purchased based on good reviews and price. However, I took a few measurements with it that made me suspicious, so I compared the results to a much more expensive model ($4,000+). While I didn't expect this level of perfection, the readings were typically 2-5 times higher than a more accurate and calibrated model. A house built in the mid 1980's was measured at over 0.9ppm (house has no new paint, carpet, kitchen, furniture etc.)! range from 0.07 to 0.17 for some measure of 0.12), but the large discrepancy this has with reality makes it unusable.