Gain Express
Gain Express CO2 Monitor 7752
$140
Gain Express CO2 Monitor 7752 Overview
The Gain Express CO2 Monitor 7752 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 0-9999 ppm measurement range. At $140, it is aimed at on-the-go monitoring, home use and offices.
In day-to-day use, the CO2 Monitor 7752 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 6 hours (6x AAA) of battery life, making it practical to carry between rooms or when travelling.
Best For
Full Specifications
| Price | $140 |
| Sensors | CO2, Temperature, Humidity |
| Sensor Type | NDIR |
| Connectivity | USB |
| Display | Yes |
| Portable | Yes |
| Battery Life | 6 hours (6x AAA) |
| CO2 Accuracy | ±75 ppm |
| CO2 Range | 0-9999 ppm |
Pros & Cons
Pros
- ✓True NDIR CO2 sensor (not an eCO2 estimate)
- ✓Built-in display for at-a-glance readings
Cons
- ✗No wireless connectivity for logging or alerts
Compare this monitor with others using our Monitor Comparison Tool
Frequently Asked Questions
Is the Gain Express CO2 Monitor 7752 accurate?+
The Gain Express CO2 Monitor 7752 uses a NDIR sensor with a stated accuracy of ±75 ppm over a range of 0-9999 ppm. NDIR is the proven reference technology for consumer CO2 monitoring.
What does the Gain Express CO2 Monitor 7752 measure?+
It measures CO2, Temperature, Humidity. CO2 is the key metric for judging ventilation — levels below 800 ppm indicate well-ventilated air.
Does the Gain Express CO2 Monitor 7752 need WiFi?+
No. The Gain Express CO2 Monitor 7752 works standalone and shows readings on its built-in display.
Is the Gain Express CO2 Monitor 7752 worth it in 2026?+
At $140, the Gain Express CO2 Monitor 7752 is a solid choice for on-the-go monitoring, home use and offices. Its NDIR sensor puts it ahead of cheaper eCO2 estimators. Compare alternatives in our monitor comparison tool before buying.
How long does the Gain Express CO2 Monitor 7752 battery last?+
The Gain Express CO2 Monitor 7752 runs for 6 hours (6x AAA), and its portable design makes it easy to move between rooms or take when travelling.