6 models · 20 specs · all prices checked May 2026 · Prices in USD. Ships from Amazon.com.
PM2.5, PM10, CO2, Temp, RH on a 3.5″ colour LCD. Best app and global AQI network.
View on Amazon →Dual-wavelength NDIR — most accurate CO2 sensor available at any consumer price. 2-year battery.
View on Amazon →Only monitor here with radon detection. Also CO2, VOC, PM2.5, Temp, RH. Critical for basements.
View on Amazon →$69 — 8 sensor channels including HCHO. Maximum data breadth at minimum cost.
View on Amazon →5 sensors · Awair Score · API access · Alexa/Google Home. Best for HVAC automation.
View on Amazon →| Core specifications | ||||||
| Sensors | PM2.5, PM10, CO2, Temp, RH | CO2, Temp, RH, atmospheric pressure | PM2.5, CO2, VOC, Temp, RH | PM1/2.5/10, CO2, VOC, HCHO, Temp, RH | Radon, CO2, VOC, PM2.5, Temp, RH | PM2.5, CO2, Temp, RH |
| PM2.5 accuracy | ±10 µg/m³ or ±10% | No PM sensor | ±15 µg/m³ or ±15% | ±20 µg/m³ (indicative) | ±20 µg/m³ (indicative) | ±10 µg/m³ or ±10% |
| CO2 range | 400–10,000 ppm (NDIR) | 0–9,999 ppm (dual-wavelength NDIR) | 400–8,000 ppm (NDIR) | 400–5,000 ppm (NDIR equivalent) | 400–5,000 ppm | 400–5,000 ppm (NDIR) |
| Display | 3.5″ colour LCD | E-ink, always-on | LED dot matrix + app | 2.4″ colour LCD | Wave LED indicator + app | E-ink circular display |
| Battery | Mains + 1-hr backup | AA × 2, up to 2 years | Mains only | USB-C rechargeable, ~4 hrs | 6× AA, ~16 months | Mains only (USB-C) |
| Data logging | Cloud + local CSV export | Bluetooth + Aranet Cloud | Cloud + API | Govee app, 30-day cloud | Airthings app + Hub (optional) | Kaiterra app + HomeKit |
| Performance scores (out of 100) | ||||||
| Accuracy | 96 | 98 | 84 | 71 | 80 | 88 |
| Sensors | 95 | 74 | 90 | 97 | 93 | 72 |
| Display / App | 98 | 85 | 91 | 78 | 80 | 82 |
| Value | 72 | 78 | 88 | 96 | 82 | 84 |
| Sensor coverage | ||||||
| PM2.5 (laser particle counter) | ✓ | ✗ | ✓ | ✓ | ✓ | ✓ |
| CO2 (NDIR sensor) | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
| True NDIR CO2 (not electrochemical) | ✓ | ✓ | ✓ | ✗ | ✗ | ✓ |
| VOC / Total VOC index | ✗ | ✗ | ✓ | ✓ | ✓ | ✗ |
| Radon detection | ✗ | ✗ | ✗ | ✗ | ✓ | ✗ |
| HCHO (formaldehyde) | ✗ | ✗ | ✗ | ✓ | ✗ | ✗ |
| PM2.5 accuracy | ±10 µg/m³ | No PM sensor | ±15 µg/m³ | ±20 µg/m³ | ±20 µg/m³ | ±10 µg/m³ |
| CO2 accuracy | ±50 ppm (NDIR) | ±30 ppm (dual NDIR) | ±75 ppm (NDIR) | ±5% (indicative) | ±5% (indicative) | ±50 ppm (NDIR) |
| Power & connectivity | ||||||
| Battery-powered option | ✗ | ✓ | ✗ | ✓ | ✓ | ✗ |
| Battery life | Mains + 1 hr backup | AA × 2 · ~2 years | Mains only | USB-C · ~4 hours | AA × 6 · ~16 months | Mains only (USB-C) |
| Cloud data logging | ✓ | ✗ | ✓ | ✗ | ✓ | ✓ |
| Open API access | ✓ | ✗ | ✓ | ✗ | ✗ | ✓ |
| Apple HomeKit | ✗ | ✗ | ✗ | ✗ | ✗ | ✓ |
| Alexa / Google Home | ✗ | ✗ | ✓ | ✗ | ✓ | ✗ |
| Warranty | ||||||
| Warranty | 2 years | 2 years | 1 year | 1 year | 2 years | 1 year |