CO2.Click
CO2.Click CO2.Click
$70
CO2.Click CO2.Click Overview
The CO2.Click CO2.Click is a budget CO2 monitor that tracks CO2. It uses a NDIR sensor — the technology we recommend for reliable CO2 readings — with a stated accuracy of ±50 ppm across a 0-5000 ppm measurement range. At $70, it is aimed at on-the-go monitoring, budget-conscious buyers and classrooms.
In day-to-day use, the CO2.Click offers an onboard display, so you can read levels at a glance without opening an app, plus USB connectivity for logging trends and setting alerts, plus a portable design with 4 hours of battery life, making it practical to carry between rooms or when travelling.
Best For
Full Specifications
| Price | $70 |
| Sensors | CO2 |
| Sensor Type | NDIR |
| Connectivity | USB |
| Display | Yes |
| Portable | Yes |
| Battery Life | 4 hours |
| CO2 Accuracy | ±50 ppm |
| CO2 Range | 0-5000 ppm |
Pros & Cons
Pros
- ✓True NDIR CO2 sensor (not an eCO2 estimate)
- ✓Built-in display for at-a-glance readings
- ✓Accessible price point for a real CO2 sensor
Cons
- ✗No wireless connectivity for logging or alerts
Compare this monitor with others using our Monitor Comparison Tool
Frequently Asked Questions
Is the CO2.Click CO2.Click accurate?+
The CO2.Click CO2.Click uses a NDIR sensor with a stated accuracy of ±50 ppm over a range of 0-5000 ppm. NDIR is the proven reference technology for consumer CO2 monitoring.
What does the CO2.Click CO2.Click measure?+
It measures CO2. CO2 is the key metric for judging ventilation — levels below 800 ppm indicate well-ventilated air.
Does the CO2.Click CO2.Click need WiFi?+
No. The CO2.Click CO2.Click works standalone and shows readings on its built-in display.
Is the CO2.Click CO2.Click worth it in 2026?+
At $70, the CO2.Click CO2.Click is a solid choice for on-the-go monitoring, budget-conscious buyers and classrooms. Its NDIR sensor puts it ahead of cheaper eCO2 estimators. Compare alternatives in our monitor comparison tool before buying.
How long does the CO2.Click CO2.Click battery last?+
The CO2.Click CO2.Click runs for 4 hours, and its portable design makes it easy to move between rooms or take when travelling.