The testo 521 is a handheld pressure-measuring instrument that was developed specifically for use in air conditioning/ventilation, cleanrooms and OPs. With an internal pressure sensor from 0 to 100 hPa the meter is ideal for Pitot tube measurements in the range 5 to 100 m/s.

• Temp. compensated differential pressure sensor (class 0.2) in instrument
• Direct calculation of velocity speed and velocity flow
• Multi-point and timed mean calculation
• Additional two probe sockets for measuring pressure and temp.
• Memory for 25000 values
• RS232 interface: Measurement data can be transferred to a PC (software is required but not included)

In the case of velocity speeds in the range from 1 to 12 m/s, users can carry out accurate measurements using the 100 Pa probe which can be attached externally.