Occupational safety measuring device PCE-AQD 10 CO2 data logger for air quality testing with adjustable storage rate, illuminated LCD, and storage on SD card as XLS. The CO2 data logger PCE-AQD 10 is used to measure air quality. It measures carbon dioxide, temperature, and humidity. The CO2 sensor is connected to the main device via a cable. The measurement values are displayed on the large screen. The air quality measurement data is stored on an SD card. The CO2 data logger can record measurement data at adjustable intervals from 1 to 600 seconds. It is used to monitor indoor air quality in living spaces, offices, schools, etc. With the SD storage, CO2 measurement data can be monitored over an extended period to initiate further measures for improving indoor air quality.