The Testo 405 Thermal Anemometer is a compact airflow meter designed for HVAC engineers, ventilation technicians and commissioning professionals who need reliable measurement of air velocity, volume flow and temperature.
Built for day-to-day duct testing, airflow balancing and draft detection, it delivers accurate performance in ventilation systems, air conditioning setups and indoor environments. With an extendable probe up to 300 mm, the 405 is ideal for accessing ductwork and confined spaces, while its high accuracy at low air speeds makes it especially effective for identifying subtle airflow issues.
How does the Testo 405 stand out in everyday use?
The Testo 405 combines precision and simplicity for fast on-site diagnostics. Its strong performance in low airflow ranges (0–2 m/s) makes it ideal for detecting drafts and inefficient ventilation.
The rotating display ensures clear readings in awkward positions, while the lightweight design and protective cap make it a practical, durable tool for routine HVAC measurements and troubleshooting.
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.
