As Australia’s HVAC industry continues to elevate its standards for energy efficiency, compliance, and indoor air quality, the need for accurate and reliable ventilation measurement tools has never been greater.
The combination of the testo 400 Universal IAQ Instrument and the testo 420 Flow Hood delivers a professional
solution that brings precision, speed, and simplicity to testing and commissioning ventilation systems.
The testo 400 acts as a universal platform for indoor air quality and airflow measurements. It combines intelligent digital probes, guided workflows, and real-time analysis of critical parameters such as air velocity, temperature, humidity, CO₂, and differential pressure. Designed with an intuitive touchscreen interface and automatic probe recognition, the Testo 400 transforms complex testing procedures into streamlined, traceable workflows — ensuring reliable, standard-compliant results every time.
Paired with the testo 420 Flow Hood, the system sets a new benchmark for air balancing and distribution testing.
Weighing in at just 2.9 kilograms, the Testo 420 is among the lightest flow hoods on the market — a true advantage for technicians working at height or across multiple air outlets.
The hood accommodates air vents up to 610 x 610 mm for square or rectangular diffusers and Ø 610 mm for circular outlets, covering the full range of typical ventilation systems.
Engineered for real-world conditions, the Testo 420 automatically compensates for turbulent airflow, providing fast and dependable measurements every time.
Combined with the data logging and reporting features of the Testo 400, technicians can seamlessly measure, document, and optimise systems in compliance with AS 1668.2 and other industry standards.
For HVAC professionals who demand precision, portability, and smarter performance, the Testo 400 and 420 represent the future of intelligent ventilation testing in Australia’s evolving built environment.