The high precision testo 521-1 differential pressure measuring instrument is ideal for accurate differential pressure measurements in air conditioning and ventilation technology, for pressure drop on filters, for instance, for checking fans and extractors, or for pitot tube measurements.

The high precision testo 521-2 differential pressure measuring instrument is ideal for accurate differential pressure measurements in air conditioning and ventilation technology, for pressure drop on filters, for instance, checking fans and extractors, or for pitot tube measurements.

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Ideal for checking pressure in sensitive industrial processes, the testo 526-1 high precision differential pressure measuring instrument&nbsp;has a measuring accuracy of &plusmn;0.1% of the final value. It also has two probe inputs for additional pressure and temperature probes.

The testo 526-2 high precision differential pressure measuring instrument is ideally suited for checking pressure in sensitive industrial processes, thanks to a measuring accuracy of &plusmn; 0.05% of the final value. Two additional pressure and temperature probes can be attached.

Pressure probe, 29 psi, measures absolute pressure

Absolute Pressure	Measuring range 0 to +800 InH₂O / 0 to +2000 hPa
	Accuracy ±2 InH₂O / ±5 hPa
	Overload 1600 InH₂O / 4000 hPa

Pressure probe, 29 psi, measures absolute pressure - Pressure probe (absolute pressure)

Pressure probe, 29 psi, measures absolute pressure - Pressure probe (absolute pressure)

Absolute Pressure

Absolute Pressure

General technical data

General technical data

General technical data	Operating temperature 32.0° to 122.0 °F / 0 to 50 °C