testo 535, CO2 measuring instrument
Gas analyzer with app connectivity and acoustic alarm, transport bag, batteries, and factory calibration protocol
Simple, fast, and accurate CO2
concentration measurement
Acoustic alarm when limit values are exceeded
Fast configuration in the app, graphical history, second screen, and storage of measurement data in the testo Smart App
High reproducibility of measurement results thanks to the long-term stable infrared sensor system
The testo 535 gas analyzer is ideally suited for simple, fast, and accurate determination of carbon dioxide levels to ensure indoor air quality and, consequently, health and productivity. Connecting to the intelligent testo App allows you to configure, display, store, and document readings directly within the app.





