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MODEL A $469 MODEL KIT1 $299 MODEL D $899 MODEL A3 $699 MODEL INDUSTRIAL $2099 SMOGGIE-PM $239 SMOGGIE-CO2 $239 SMOGGIE-GAS $469 MODEL CITY $4499 MODEL seeRADON $699 MODEL BUZZ $239 SENSIGAS $899 MODEL A4 $529 Outdoor shield for MODEL A3 $99 Serial Geiger module $36 uRADMonitor SMOGGIE-PM (used) $99 -50% uRADMonitor SMOGGIE-HEAT-PM (used) $99 -50% Stevenson Shield for MODEL A4 $59 uRADMonitor SENSIGAS (refurbished) $749 Stevenson Shield for MODEL A $59 Maintenance parts MODEL A3 $120
MODEL A4
Hardware version 5

MODEL A4

Available, ships right away.
Multiparameter advanced air quality monitoring station, in a rainproof enclosure for both outdoor and indoor use. Contains 8 individual sensors to track Temperature, Relative Humidity, Nitrogen Dioxide, Formaldehyde, Carbon Monoxide, Ozone, Carbon Dioxide, Particulate Matter PM1, PM2.5, PM10 and Volatile Organic Compounds (VOC). Modular design that saves costs. Stevenson shield included, ready for outdoor use!
In the box
Power adapter, instructions
Resources
Live example Datasheet API USB Documentation Contact us
$529USD
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Pat, UK: "So impressed with all your work, and a bit jealous of your talents!"

uRADMonitor model A4, in its latest hardware version 5, uses a MEMs sensor to measure air temperature and humidity. A MOX VOC sensor measures volatile organic compounds. A high quality laser scattering sensor is used to detect the Particulate Matter PM1 / PM2.5 and PM10 mass concentration in air. There are four electrochemical sensors, one for formaldehyde (CH2O), another one for Ozone (O3), one for Carbon Monoxide (CO) and a fourth one for Nitrogen Dioxide (NO2). A nondispersive infrared sensor for CO2. Everything is encapsulated under a high quality Stevenson Shield ready for outdoor use.
Picture: uRADMonitor A4 has a modular design with sensors on a separate board that can be replaced all together easily
SensorParameterMinimum valueMaximum value
MEMsTemperature-20 °C+65 °C
Humidity0% RH100% RH
Laser scatteringPM1.00 μg/m³ 1000 μg/m³
PM2.50 μg/m³ 1000 μg/m³
PM100 μg/m³ 1000 μg/m³
ElectrochemicalFormaldehyde0 ppm 5 ppm
ElectrochemicalOzone0 ppm 10 ppm
ElectrochemicalCarbon Monoxide0 ppm500 ppm
ElectrochemicalNitrogen Dioxide0 ppm20 ppm
NDIRCarbon Dioxide400 ppm 5000 ppm
MOXVOC 0 10mg/m3
On MODEL A4 pre HW5, VOC concentration is provided as a simple score 0 - 3 to reflect air quality

Model A4 is a cost-effective, automated multiparameter monitor equipped with eight high-quality digital sensors that measure a total of 11 air quality parameters. While it is not as sensitive as the larger model CITY (meaning some readings can come as flat lines when under the detection threshold), it offers an excellent balance between performance and affordability, making it a practical choice for many applications. It is capable of contributing to ambient air quality characterization by monitoring the major pollutants that have the greatest impact on human health.
Your uRADMonitor unit can be mounted both indoors and outdoors. Its enclosure offers protection to the elements, including sun, rain and snow. A covered spot with some shadow if installed in the free air, is ideal. The stevenson shield enclosure has large air vents, make sure that nothing is blocking them and air can circulate freely. The enclosure has pole / wall-mounting brackets, making installation easy.
Connect the uRADMonitor to the power source using the USB-C cable and the provided USB 5V Adaper.
uRADMonitor Model A4 Works via WIFI
Use a smartphone or a computer with WLAN capabilities to connect to the local hotspot spawned by your A4 unit. The SSID is uRADMonitor-XX, where XX are the last two digits of the Device ID number. The key is the "uradmonitor", in lowercase and without the quotes. You can change this default password later on. Open 192.168.4.1 in your browser, and click the "CONFIG" link to setup the connection to the Internet AP. Enter the SSID and key of your Internet Access Point. If the connection fails, you will see the status message, and three consecutive beeps will indicated the problem. Alternatively you can change the configuration using the USB data port. See the USB manual.

Remember, the Wifi settings can be customized via the USB connection. Consult your product manual for complete details.