Portable meter/datalogger with SD card - Air Quality - PM2.5, CO2, Temp, Humidity, Barometer - Ranges PM2.5 : 0 to 250 ? g/m^3 / Humidity : 5 to 95 %RH / CO2 : 0 to 10,000 ppm, Barometer : 10 to 1100 hPa / Temperature : 0 to 50 °C