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The measurement of the carbon dioxide content in the room air is crucial for room air quality and comfort. In order to get quick accurate results you need a suitable measuring device. The compact testo 535 CO 2 meter with practical app connectivity lets you take this important measurement as easily and efficiently as possible, ensuring indoor comfort and a healthy climate. Thanks to the long-term stable infrared sensors, the measured values can be reproduced and comparable even over long periods of time. Ideal for recurring comparative measurements. The temporal and selective average calculation directly in the measuring device also supports you. Display of the measured values as table or graph, saving of the results and documentation is handled by the testo Smart APP. Not only can the device be individually configured, the APP also turns your smartphone into a second display!