• Universal airflow / IAQ instrument
• Probes sold separately
• Smart, intuitive measurement programs including HVAC volume flow grid measurement as per ASHRAE 111, PMV/PPD and turbulence as per ASHRAE 55
• High-precision, location-independent and integrated differential pressure sensor meeting the NEBB Instrument requirements for Air pressure
• Measure all Air flow, Comfort and IAQ-related parameters - with our wide range of probes
• Document measuring values directly on the customer's site and send them by e-mail, or further analyze them using the testo DataControl PC software

The testo 400 is the universal measuring instrument for all TAB / Commissioning and IAQ professionals. Measure, analyze and document Air flow, air pressure, IAQ and comfort level parameters using just one instrument - simply, conveniently and in compliance with the standards. High-quality measuring technology, intuitive measurement assistants, versatile documentation options and a comprehensive selection of air flow, comfort and IAQ probes make the testo 400 the perfect partner for your day-to-day work. Smarter: Easiest handling. The new universal air flow and IAQ measuring instrument testo 400 and its broad selection of precision probes were developed with just one objective in mind: To make all measurement tasks in the ventilation and air conditioning sector easier and less complicated than ever before. Better: Error-free results with the measurement data assistant With the testo 400, you always have your own personal smart helper with you. The more demanding the measurement, the more the measurement assistant in the instrument supports you in configuration, execution and evaluation of results. Fast Support The measurement assistant is there to help you in all relevant measurements. Thanks to intuitive menu structures and graphic presentation, you never lose the overview, even with multiple measurement points.