The AcuRite Notos is the cheapest model. The station does not measure wind direction or rainfall but measures indoor and outdoor temperature, humidity, wind speed, and barometric pressure. The AcuRite Iris includes all of the measurements above and adds a rain gauge and a wind vane for wind direction, while the Atlas further adds UV and light intensity (lux) and optional lightning detection. We have a comparison chart for you later in this blog post.