UNIT CO2L is a digital air CO2 concentration detection unit with a single-measurement low-power mode, built-in Sensirion’s SCD41 sensor and power buck circuitry, and I2C communication. The unit is suitable for the measurement of air ambient conditions with a typical accuracy of ± (40 ppm + 5 % reading) for CO2 measurements over a measuring range of 400 ppm – 5000 ppm while measuring ambient temperature and humidity.