The Testo 440 is a versatile air velocity and indoor air quality (IAQ) measuring instrument designed for professionals in HVAC, building management, and environmental monitoring. This advanced device offers precise measurements of air velocity, volume flow, temperature, humidity, and IAQ parameters such as CO2, VOCs, and PM2.5. With a wide range of compatible probes, it is highly adaptable for various applications, from air quality assessments to ventilation system commissioning and maintenance.

The Testo 440 features a large, color display and an intuitive interface for easy navigation and real-time data analysis. Its robust design ensures durability in both field and laboratory settings, while the rechargeable battery provides long-lasting performance. Whether used for troubleshooting, system optimization, or ensuring compliance with air quality standards, the Testo 440 delivers accurate and reliable results to maintain optimal indoor air conditions.