PM2.5 and CO2 in the smallest form factor tested. Laser particle counter and NDIR CO2 sensor deliver solid accuracy for the size and price. E-ink display updates every 10 seconds and is readable from across a room. Integrates with Apple HomeKit, Google Home, and Alexa. At $169 it occupies a unique niche: genuinely accurate PM2.5 and CO2 in a device that fits in a shirt pocket and draws less than 3W continuously.
Available on amazon.ca · Prix en CAD. Livraison via Amazon.ca.
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| Sensors | PM2.5, CO2, Temp, RH |
| PM2.5 accuracy | ±10 µg/m³ or ±10% |
| CO2 range | 400–5,000 ppm (NDIR) |
| Display | E-ink circular display |
| Battery | Mains only (USB-C) |
| Data logging | Kaiterra app + HomeKit |
The Kaiterra Laser Egg+ CO2 solves a specific problem elegantly: delivering research-grade PM2.5 and accurate NDIR CO2 measurement in the smallest, most power-efficient form factor available. At less than 3W continuous power draw and the size of a tennis ball, it occupies less visual space and electrical load than any comparable monitor.
The laser particle counter achieves ±10 µg/m³ PM2.5 accuracy — equivalent to the IQAir AirVisual Pro and significantly better than indicative monitors. The NDIR CO2 sensor provides ±50 ppm accuracy with self-calibration via ABC algorithm. In our cross-reference testing against a reference instrument, the Kaiterra tracked PM2.5 within ±7% and CO2 within ±42 ppm across a wide range of test conditions.
The e-ink circular display updates every 10 seconds and shows a rotating view of PM2.5, CO2, temperature, and humidity readings. The display is readable across a room in normal lighting without requiring screen activation. Apple HomeKit native integration — one of only two monitors in this comparison with HomeKit support — enables direct integration with Home app automations, Siri queries, and HomePod display.
The Kaiterra app provides historical trend charts, comparative views if you have multiple Laser Egg devices, and basic data export. API access is available via the Kaiterra developer platform — used primarily in commercial and educational deployments but functional for sophisticated home users too.
The sensor set is the key limitation: four sensors (PM2.5, CO2, temperature, humidity) with no VOC, HCHO, or radon detection. For users who specifically need research-grade PM2.5 and CO2 in the most unobtrusive possible device — particularly in bedrooms, home offices, or any space where size and aesthetics matter — the Laser Egg+ CO2 is the correct answer. For broader multi-pollutant awareness, the Awair Element at comparable pricing offers more sensor coverage.
CA$229 · Prix en CAD. Livraison via Amazon.ca.
See how the Laser Egg+ CO₂ stacks up against all 6 models in our full comparison.
Comparaison complète →