🌬️ Accurate Indoor Air Quality Monitoring: Extech VFM200 VOC/Formaldehyde Meter Review

Useless. I tried to check the air quality in the house, in the car, on the street, I expected it to show relatively stable readings. But after the countdown to zero finishes and the meter is supposed to take actual readings, the reading instead continues to drop to near zero, even in a smelly new car with the window closed on a hot summer's day. Trademark EXTECH, hence paid 4/5 star reviews ignored. Unfortunately, this product didn't live up to my lowest expectations.

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…

I own a ventilation business and offer indoor air quality testing as an extra service. The meter worked well for a few months, then it was put into storage while we focused on a large job that took many months. When we got back to testing in the air, it turned out that the machine was no longer working properly. It is currently 100% unusable as the results continue to show 0 for both VOC and HCHO. This may be common with HCHOs, but it is extremely unlikely or almost impossible to see 0 with…

I got this from the Revain Vine range. Here's what I found: 1. The device is very nicely made! The charger features multi-country plugs that can be quickly swapped out so you have exactly what you need. Not sure how many people need plugs for different countries but they are available and it also means you can order them no matter what country you are in. 2. The supplied lithium battery is not fully charged as expected. So I connected the charger as directed. This led to great disappointment…