Testo 0560 5350 precision co meter for air quality measurements testo 0560 5350 p this gas meter from testo is designed to measure the carbon dioxide concentration in the ambient air because stale air has a much higher co2 concentration than fresh air it is ideal for monitoring and optimising the room climate in offices etc and can also be used to check if existing air conditioning and ventilation systems are providing the relevant rooms with enough fresh air p p this meter has a high p