GZAIR
GZAIR Model B
$85
GZAIR Model B Overview
The GZAIR Model B is a mid-range CO2 monitor that tracks CO2, Temperature and Humidity. It uses a NDIR sensor — the technology we recommend for reliable CO2 readings — with a stated accuracy of ±75 ppm across a 400-5000 ppm measurement range. At $85, it is aimed at home use and smart home setups.
In day-to-day use, the Model B offers an onboard display, so you can read levels at a glance without opening an app, plus WiFi and USB connectivity for logging trends and setting alerts, plus a stationary design (USB powered) best suited to continuous monitoring in a fixed location.
Best For
Full Specifications
| Price | $85 |
| Sensors | CO2, Temperature, Humidity |
| Sensor Type | NDIR |
| Connectivity | WiFi, USB |
| Display | Yes |
| Portable | No |
| Battery Life | USB powered |
| CO2 Accuracy | ±75 ppm |
| CO2 Range | 400-5000 ppm |
Pros & Cons
Pros
- ✓True NDIR CO2 sensor (not an eCO2 estimate)
- ✓Built-in display for at-a-glance readings
- ✓WiFi connectivity for remote monitoring and history
- ✓Accessible price point for a real CO2 sensor
Cons
- ✗Not designed for portable use
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Frequently Asked Questions
Is the GZAIR Model B accurate?+
The GZAIR Model B uses a NDIR sensor with a stated accuracy of ±75 ppm over a range of 400-5000 ppm. NDIR is the proven reference technology for consumer CO2 monitoring.
What does the GZAIR Model B measure?+
It measures CO2, Temperature, Humidity. CO2 is the key metric for judging ventilation — levels below 800 ppm indicate well-ventilated air.
Does the GZAIR Model B need WiFi?+
The GZAIR Model B supports WiFi (plus USB) for remote monitoring, but the onboard display works without any connection.
Is the GZAIR Model B worth it in 2026?+
At $85, the GZAIR Model B is a solid choice for home use and smart home setups. Its NDIR sensor puts it ahead of cheaper eCO2 estimators. Compare alternatives in our monitor comparison tool before buying.