
Testo · testo 400
testo 400 - Universal IAQ and air flow measuring instrument
The testo 400 is a universal measuring instrument for all professional HVAC technicians. Measure, analyse and document all parameters relating to air conditioning, ventilation and thermal comfort with a single instrument – simply, conveniently and in compliance with standards. The high quality of the instrument, intuitive measurement assistants, extensive documentation options and a wide choice of climate probes make the testo 400 the perfect partner for your daily work.











