for the quality of air in rooms is crucial to measure the content of carbon dioxide in the air indoors. You need a suitable measuring device to obtain quick and accurate results. The compact CO2 meter – Testo 535 with a practical mobile application allows you to perform this important measurement easily and efficiently – and thus provide comfort and healthy internal climate. Due to the stable infrared sensory technology, the measured values ​​are reproducible and comparable even for longer periods of time. Ideal for repeated comparative measurements. The appliance also performs averaging during the time and points. Thanks to the Testo Smart App app, the measured values ​​are stored and visualized as a table or graphics. The app only assists in configuring the appliance, but also turns your smartphone into a second display!