The testo 330 is an advanced flue gas analyzer designed to give HVAC/R professionals clear insights and reliable results in increasingly complex working environments. The large 5.5" IPS touchscreen with app-like interface guides you step by step through flue gas and efficiency measurements, minimizes setup time and reduces operating errors in the field.
This flue gas analyzer is equipped with a Testo O₂ sensor, a high-performance CO/H₂ sensor and an integrated NO sensor. In combination with active dilution, the platform offers an extended CO range up to 40,000 ppm, enabling safe and stable measurements even at higher CO concentrations. The additional NO channel supports detailed combustion optimization and emissions assessment, particularly on modern low-NOx and high-efficiency systems.
With measurement ranges tailored to typical combustion applications and automatic zeroing, the instrument delivers stable and accurate readings for O₂, CO, NO, draught, efficiency, flue gas loss and more — even under demanding conditions. Robust design (IP40), a proven sensor platform developed by Testo and TÜV-tested flue gas probes ensure long-term reliability in daily field use.
Thanks to its integrated Bluetooth interface, the testo 330 connects seamlessly to the testo Smart App and to up to four wireless probes, enabling remote control, second screen operation and the integration of temperature, differential pressure, CO and CO₂ measurements. Measurement data is stored in the large internal memory and can be synchronized via testo Smart Connect for centralized data management across jobs, devices and teams. A powerful rechargeable battery with fast USB-C charging provides up to 10 hours of operation, ensuring the analyzer is ready for a full working day.