Indoor Air Quality Sensor
Six sensors. Twelve signals.
A premium home and commercial air-quality sensor that connects indoor readings to outdoor context and turns every change into a clear next step.
Twelve signals
Six sensors give eleven measured readings plus a calculated IAQ index. COâ‚‚ is photoacoustic.
Sensor specifications
| Parameter | Sensor | Range | Accuracy |
|---|---|---|---|
| CO₂ | Sensirion SEN66 · photoacoustic | 400–5,000 ppm | ±(50 ppm + 2.5%) at 400–1,000 ppm¹ |
| PM1.0 / 2.5 / 4.0 / 10 | Sensirion SEN66 · laser | 0–1,000 µg/m³ | ±(5 µg/m³ + 5%) precision² |
| VOC Index | Sensirion SEN66 · VOC algo | 1–500 | per Sensirion |
| NOₓ Index | Sensirion SEN66 · NOx algo | 1–500 | per Sensirion |
| Temperature | Sensirion SEN66 | −10–50 °C | ±0.45 °C typ. |
| Relative humidity | Sensirion SEN66 | 0–100% RH | ±4.5% RH typ. |
| Barometric pressure | Bosch BMP390L | 300–1,250 hPa | ±0.5 hPa |
| Ambient light | TI OPT3001 | 0.01–83,000 lx | photopic |
Values from the Sensirion SEN66, Bosch BMP390L and TI OPT3001 datasheets. Temperature accuracy is rated at 15–30 °C and humidity accuracy at 30–70% RH. ¹ CO₂ accuracy is ±(50 ppm + 2.5%) at 400–1,000 ppm, ±(50 ppm + 3%) at 1,001–2,000 ppm and ±(40 ppm + 5%) at 2,001–5,000 ppm. It applies after 2 days of operation that include fresh air, with automatic self-calibration on and fresh air (about 400 ppm) at least once a week. Starting after five years, typical additional drift is ±(5 ppm + 0.5%) per year. ² Device-to-device precision for PM1.0 and PM2.5 at 0–100 µg/m³ (±10% at 100–1,000 µg/m³); PM4.0 and PM10 are ±25 µg/m³ (±25% above 100 µg/m³). The VOC and NOₓ indices meet specification after about 1 and 6 hours of operation. Full per-sensor evidence at terrestream.com/evidence.
One color language
The device underglow and the app speak one color language across every signal.
System & connectivity
Power
- Plug-in USB-C with Power Delivery; no battery
- 5 V·3 A / 9 V·2 A / 12 V·1.5 A
- 18 W maximum
Local-first integrations
- Native Home Assistant
- MQTT + local HTTP API
- Compatible with Alexa through the Terrestream skill (US English, United States)
Software
- Web dashboard + mobile app included
- Plain-English recommendations
- Privacy-first, local-first data
Compliance, warranty & box
Regulatory: FCC Supplier's Declaration of Conformity (SDoC): compliant; the radio module carries its own FCC ID. Wireless: 2.4 GHz Wi-Fi only; Bluetooth LE. Size: 69 × 65 × 111 mm (2.72 × 2.56 × 4.37 in); 6.7 oz (190 g). Warranty: 1-year limited. Returns: within 30 days of delivery, even if opened and used; the buyer pays return shipping. In the box: sensor, 6 ft (1.8 m) USB-C cable, power adapter, printed guide. Shipping: ships the next business day via FedEx. Aerodyne Inc. · Dover, Delaware, USA