How We Research
Every guide on Zyentia starts with one question: will this monitor show the reading you actually care about? A radon meter, a CO2 monitor and a particle monitor answer very different questions.
Here is how we work it out.
1. We start with what you want to measure
Some readers want a radon number for the basement. Others want to watch CO2 in a home office or particles while they cook.
So we first check which sensors a monitor has. A model without the right sensor can't help, however good its app is.
2. We compare specs and features
We look at the sensors, the units shown, how often the reading updates and how long the data history goes back. We also check battery or plug-in power, Wi-Fi or Bluetooth, the screen and any alerts.
Makers describe their own sensors and accuracy, so we name the brand for each claim. Consumer monitors have stated tolerances, and we quote them rather than guess.
3. We look at buyer feedback
We read what buyers report after weeks or months with a monitor. We look for patterns, like readings that drift, app problems, short battery life or a hard setup.
One unhappy buyer doesn't sink a product. A clear pattern does.
4. We score each product
Our score weighs specs, features and buyer feedback against what you're shopping for. The same monitor can score higher in a radon guide than in a particle guide.
Scores spread out on purpose. A 10 is rare.
5. We keep pages current
Monitors get new versions and close model numbers, so we check each model and link only new units. We leave out monitors with a known recall and brands with no track record.
When a guide changes, the "Updated on" date at the top changes too.
What our picks are not
Our picks are research, not lab tests. We don't claim to have used every monitor we cover.
A home monitor gives readings, not a diagnosis. For radon, follow the EPA's guidance and confirm a high result with a second test.
A CO2 monitor or air quality monitor never replaces a carbon monoxide alarm.