• 0560 0400
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  • Measures air velocity, temperature, humidity, pressure, illuminance, radiant heat, turbulence, CO₂ and CO
  • High-precision, location-independent and integrated differential pressure sensor
  • High-quality digital probes and an intelligent calibration concept
  • 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
  • Smart and intuitive measurement programs:
    • HVAC grid measurement in accordance with ASHRAE 111
    • PMV/PPD in accordance with ASHRAE 55
    • Draft and degree of turbulence in accordance ASHRAE 55


Testo 400 is the universal measuring instrument for all TAB / Commissioning and IAQ professionals, enabling them to measure, document and analyze all IAQ parameters with just one instrument. Your benefits: - Smart support through stored measurement menus and evaluation of measuring values according to the traffic light principle – for error-free measurements - Manage all the relevant customer data, including measuring points, directly in the instrument - work directly and efficiently on site - Complete and send measuring values with full documentation, including photos, comments and your own logo directly on site – get to the next job faster - Probe heads can be changed without restarting the instrument – easy handling with no lost time - Calibration of probes which is independent of the measuring instrument and adjustment function at up to six measuring points for zero-error display – fewer downtimes and high-precision measurements