What is the Testo 420 Volume Flow Hood (0563 4200)?
The Testo 420 Volume Flow Hood is a lightweight, precision instrument designed for fast and accurate air volume and flow measurement on large air inlets and outlets. Ideal for commissioning, balancing and maintaining HVAC and ventilation systems in hospitals, offices and cleanrooms, it helps ensure compliance with indoor air quality (IAQ) and hygiene standards.
With an integrated flow straightener, the Testo 420 eliminates turbulence errors at swirl outlets, delivering reliable readings even in challenging airflows. At just 2.9 kg, it’s one of the lightest hoods in its class, making overhead testing safer and less fatiguing for on-site professionals.
How does the Testo 420 simplify HVAC testing?
The Testo 420 combines precision airflow measurement with intelligent digital functionality. Its Bluetooth® connectivity links directly to the Testo app, allowing you to view readings remotely, use your phone as a secondary display and even create and email reports on-site, perfect for fast, paperless documentation.
The removable and tiltable measuring instrument makes it easy to read values at any height, while optional tripods and hood sizes expand its versatility for different ceiling diffusers and outlet configurations. Whether you’re commissioning new systems or verifying ventilation rates, the Testo 420 helps you get accurate results quickly and comfortably.
Order today to enjoy free delivery, expert support and our 90-day satisfaction guarantee. Need advice? Our team is here to assist you.
Why choose Instrotech for your electrical test equipment?
With over 40 years’ experience supporting UK electricians, technicians and engineers, Instrotech is your trusted partner for quality tools and expert service. When you purchase from us, you benefit from:
Free UK shipping on all orders
Access to our knowledgeable technical support team
Available calibration services to maintain safety compliance
A 90-day money-back guarantee for complete peace of mind
We’re committed to helping you work safely and efficiently with industry-leading products and ongoing support.
