CO2 unit is a highly efficient and accurate photoacoustic Carbon Dioxide (CO2) sensor designed to measure the composition of CO2 in ambient air. Equipped with a built-in Sensirion SCD40 CO2 sensor, the unit utilizes Buck converter circuitry for power management and supports I2C communication. It offers a wide measurement range of 400 to 2000 ppm with an impressive accuracy of ±(50 ppm + 5% of reading). In addition, CO2 Unit also provides temperature and humidity measurement capabilities.CO2 Unit has a temperature measurement range of -10 to 60℃, allowing for accurate monitoring of temperature fluctuations in the surrounding environment. Additionally, it offers a humidity measurement range of 0 to 95% relative humidity (RH), enabling users to assess and track humidity levels effectively. With this wide temperature and humidity measurement range, CO2 Unit provides comprehensive environmental data for various applications, ensuring that users can monitor and maintain optimal conditions in their desired settings.With its compact design and reliable performance, CO2 Unit is well-suited for both professional and personal use. Its ease of integration, thanks to the I2C communication support, enables seamless connectivity with various devices and systems. Whether used in research laboratories, industrial settings, or residential environments, this unit offers a reliable and efficient solution for CO2 measurement, temperature monitoring, and humidity analysis.