Aranet4 Home CO2 Monitor
The reference consumer CO2 monitor: a battery-powered e-ink puck with a true NDIR sensor that shows at a glance how badly a room needs ventilating.
4.5 / 5
★★★★★ ★★★★★ Outstanding
Strengths
- Genuine NDIR sensor with class-leading rated accuracy for a consumer device
- Always-visible e-ink display with simple green/amber/red guidance - no app needed day to day
- Runs for months to years on two AA batteries; rechargeables work
Watch outs
- Premium price - notably more than newer rivals with comparable rated accuracy
- Hardware has barely changed since release; no Wi-Fi, only short-range Bluetooth
- Not waterproof and somewhat fragile - the e-ink screen wants a case in a bag
- CO2 sensor True NDIR (Senseair Sunrise), 0-9999 ppm, accuracy +/-(30 ppm + 3% of reading)
- Other sensors Temperature (0-50 C, +/-0.3 C), relative humidity, atmospheric pressure
- Display Always-on e-ink with colour-coded CO2 status and optional buzzer (default red threshold 1400 ppm)
- Power 2 x AA batteries; battery life from many months up to ~4 years depending on measurement interval and battery type
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By Rob Griffiths1 min read
- CO2 sensor
- True NDIR (Senseair Sunrise), 0-9999 ppm, accuracy +/-(30 ppm + 3% of reading)
- Other sensors
- Temperature (0-50 C, +/-0.3 C), relative humidity, atmospheric pressure
- Display
- Always-on e-ink with colour-coded CO2 status and optional buzzer (default red threshold 1400 ppm)
- Power
- 2 x AA batteries; battery life from many months up to ~4 years depending on measurement interval and battery type
- Connectivity
- Bluetooth to the free Aranet Home app (trends, history, alert thresholds)
- Dimensions
- 70 x 70 x 24 mm, 104 g
- Calibration
- Factory-calibrated; automatic background or manual recalibration supported
- Warranty
- 2 years (extendable to 3)
- Subscription
- None