Connector-side view of the white VisiblAir Model O with Québec and Canada provenance marks
Three-quarter top view of the white VisiblAir Model O

Model O Air Quality Sensor

Monitor CO2, PM2.5, VOC, NOx, barometric pressure, temperature, and humidity over 2.4 GHz Wi-Fi, wired Ethernet, or optional LTE. Power Model O by USB-C or add optional PoE.More ways to connect: Optional Bluetooth for Sensirion MyAmbience or BTHome v2, plus up to five saved Wi-Fi networks. Explore connectivity options.

Engineered, assembled and tested in Québec, Canada.Prepared to order and shipped from Canada to customers in Canada, the United States, and worldwide.

Experience Comprehensive Air Quality Monitoring with VisiblAir Model O (2026 Edition)

Elevate your indoor environment with the VisiblAir Model O—the ultimate air quality monitoring solution designed for homes, offices, and schools. This advanced multi-sensor monitor provides measurements of CO₂, particulate matter (PM), volatile organic compounds (VOC), nitrogen oxides (NOx Index), temperature, humidity, and barometric pressure, ensuring a complete picture of your air quality.

Choose 2.4 GHz Wi-Fi or LTE for wireless connectivity; wired Ethernet remains available and takes priority when connected. Power Model O separately by USB-C, or select optional Power over Ethernet (PoE) to carry power and data over one Ethernet cable. Each connection can sync readings to the cloud portal for remote monitoring and historical analysis.

Free Cloud Access for Up to 10 Devices. Manage and monitor up to 10 sensors under a single account at no cost! Perfect for multi-room setups in homes, offices, or educational institutions.

See how the VisiblAir Cloud Portal works

Note: Cloud portal access for additional sensors beyond 10 are available for a nominal fee of $5 CAD per month or $50 CAD per year plus applicable taxes per sensor.

Planning a fixed deployment? See the office and building guide or school guide for Ethernet, PoE, placement and multi-room guidance.

$289.00 CAD

Optional LTE module: +$90 CAD ($379 CAD with the standard USB-C and USA/Canada charger options, before shipping and tax). The buyer supplies an activated Cat-M1 SIM and data plan; cellular service is not included.

Ready to order

  • Availability: Orders ship within 3–5 business days following receipt of the order.
  • Shipping: Ships worldwide from Canada; cost is calculated at checkout. Duties and import taxes are the buyer's responsibility.
  • Warranty and returns: 12-month warranty. Return and refund requests may be made within 30 days after delivery, subject to the return conditions.
  • Cloud: Portal access is free for up to 10 sensors. Each additional sensor is $5 CAD/month or $50 CAD/year, plus tax.
  • Connectivity: 2.4 GHz Wi-Fi or wired Ethernet; optional LTE module for +$90 CAD. The buyer supplies an activated Cat-M1 SIM, data plan, and carrier APN.
  • Power: Use USB-C or add optional PoE. Regional USB-C chargers or no charger are available.

School, office, or multiple units? Request a quote.

Specifications

  • Dimensions: 138mm x 139mm x 33mm
  • Construction: White and black PETG with wood insert
  • CO₂ Sensor: Sensirion SCD-30
  • CO₂ Range: 0 to 10,000 ppm
  • CO₂ Accuracy: ±30 ppm + 3% MV (at 25 °C, 400 to 10,000 ppm)
  • Particulate Matter Sensor: Sensirion SEN-55
  • PM Ranges: PM1.0, PM2.5, PM4.0, PM10 (PM4.0 and PM10 interpolated)
  • PM Accuracy: ±10 µg/m³ (0-100 µg/m³), ±10% (100-1000 µg/m³)
  • VOC Sensor: Sensirion SEN-55
  • VOC Range: VOC index 0 to 500
  • VOC Accuracy: ±5 VOC Index points
  • NOx Sensor: Sensirion SEN-55
  • NOx Range: Sensirion NOx Index 0 to 500
  • NOx Accuracy: ±5 NOx Index points
  • Barometric Pressure Sensor: Integrated
  • Connectivity: 2.4 GHz Wi-Fi, wired Ethernet, or optional LTE (Cat-M1 SIM and APN required)
  • Bluetooth: Bluetooth Low Energy (BLE), with selectable MyAmbience or BTHome v2 mode; disabled by default
  • Power: USB-C or optional PoE
  • Temperature Range: -40 °C to 70 °C
  • Temperature Accuracy: ±(0.4 °C + 0.023 x (T [°C] - 25 °C))
  • Humidity Range: 0% to 100% RH
  • Humidity Accuracy: ±3% RH
  • Operating Temperature: 0 °C to 60 °C

Network and Bluetooth options

Model O offers local Bluetooth options and saved Wi-Fi networks alongside its Wi-Fi, Ethernet, or optional LTE connection to the VisiblAir Cloud Portal.

When Ethernet is enabled and connected, it takes priority. Otherwise, choose Wi-Fi or LTE as the wireless transport in device setup. For LTE, install your unlocked, activated Cat-M1 SIM and enter your carrier's APN. You supply the SIM and data plan; cellular service is not included. LTE does not automatically switch to Wi-Fi if cellular service is unavailable.

LTE setup: Follow the quick setup guide to open the Model O configuration page, select LTE as the wireless transport, enter your carrier's APN, then save and restart. If LTE cannot connect, the device opens its Wi-Fi configuration access point for recovery.

  • Sensirion MyAmbience: View nearby live CO₂, PM2.5, VOC index, NOx index, temperature, and humidity readings in the MyAmbience app over Bluetooth. This mode works without Wi-Fi or Ethernet.
  • BTHome v2: Broadcast CO₂, temperature, humidity, PM2.5, PM10, and pressure when available to nearby receivers such as Home Assistant. Broadcasts are unencrypted; VOC and NOx indexes are not included.
  • Saved Wi-Fi networks: Store up to five networks. When Ethernet is unavailable, Model O can automatically try the saved networks. Manage them on the local setup page or in authenticated local Settings.
  • Local controls: The PIN-protected local Readings, Device status, and Settings pages are available over Wi-Fi or Ethernet, not LTE. Settings also provides firmware upload without entering setup mode.

Bluetooth is disabled by default. Select either MyAmbience or BTHome in the configuration portal or authenticated local Settings; only one Bluetooth mode operates at a time. Check the installed firmware version on the local Device status page.

Documents

Quick Setup Guide

Download the Wi-Fi and Ethernet quick setup guide for your Model O v2 / 2026 sensor. For LTE setup, see the network options above.

Download Wi-Fi/Ethernet Quick Setup Guide (PDF)

Firmware Changelog

Review firmware releases, fixes, and improvements for Model O v2 / 2026.

Customer Reviews

The response from the time ordered to receiving the email invoice was in seconds. The hands on calibration to shipping and operation were easily spelled out and added appreciation or understanding that visiblair is serious in what they do and the products they market. In a climate crisis and seemingly never ending wild fires, having this tool is very much in the realm of a life saver. I am ecstatic to have this security inside and out.

by J.R. · Model O and Model X2 customer

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VOC / TVOC Guidance

Review how VOC index readings should be interpreted indoors and when ventilation should be improved.

Read the VOC Guide

CO2 Calibration Help

Review the recommended calibration check interval and outdoor reference range for CO2 sensors.

See Calibration Steps

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