Testo 521-3 – Differential pressure measuring instrument (up to 2.5 hPa)

The testo 521-3 high-precision differential pressure measuring instrument easily determines even the smallest differential pressures (up to +2.5 hPa). Its high accuracy and a resolution of 0.1 Pa make the instrument ideal for differential pressure measurements in clean rooms or for flue inspections.

Product benefits:

  • Integrated temperature-compensated differential pressure sensor with accuracy of up to ± 0.5 Pa
  • Calculation of the flow velocity and the volume flow via Pitot tube (optional)
  • Direct zeroing of the display values of pressure probes
  • 2 probe inputs for additional pressure and temperature probes

SKU: 0560 5213.

The testo 521-3 differential pressure measuring instrument is designed for high-precision differential pressure measurements in air conditioning and ventilation technology. It can be used, for example, for measurements in clean rooms and for flue inspections – thanks to a high level of accuracy and outstanding resolution. In conjunction with a Pitot tube (optional), the integrated pressure sensor measures flow velocities of +1 to +20 m/s.

  • Testo 521-3 differential pressure measuring instrument
  • including calibration protocol
  • batteries

Measuring range

-40 to +150 °C


±0.2 °C (-10 to +50 °C) 0.4 °C (Remaining Range)


0.1 °C

Testo 512-3 – Download

Testo 512-3 – upustvo – Download