Weighing less than 1 kg, E4100 measures up to 4 gases – CO, NO, NO2, SO2, H2S, O3, and VOCs – in addition to such basic weather data as humidity, atmospheric pressure, and temperature. Particle counter, also available, includes particle measurements PM 2.5 and PM10 for particles smaller than 2.5 and 10 µm dia. All measurement data can be sent to Web-based database or proprietary systems via wireless Internet connection.