testo 521-1 – differential pressure measuring instrument (0.2% of f.v.)

testo 521-1/-2/-3 are highly accurate differential pressure measuring instruments with an internal sensor. The versionstesto 521-1 and testo 521-2 both have ameasuring range from 0 to 100 hPa, however they are available in two accuracy classes: – testo 521-1: accuracy 0.2 % of final value – testo 521-2: accuracy 0.1 % of final value testo 521-1 and testo 521-2 are optimally suited to checks on extraction systems and ventilators and for the monitoring of pressure drop at filters