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.

General technical data	Operating temperature 32.0° to 122.0 °F / 0 to +50 °C
	Housing Metal housing
	Static pressure 400 InH₂O / 1,000 hPa
	Zeroing 8 InH₂O / 20 hPa

Differential Pressure	Measuring range 0 to +400 InH₂O / 0 to +1000 hPa
	Accuracy ±0.5 % of mv (+80 to +1000 InH₂O) / ±0.5 % of mv (+200 to +1000 hPa) ±0 InH₂O (0 to +200 InH₂O) / ±1 hPa (0 to +200 hPa)
	Resolution 0.1 InH₂O / 0.1 hPa
	Overload 800 InH₂O / 2000 hPa

Precision pressure probe, 14.5 psi

Precision pressure probe, 14.5 psi

General technical data

General technical data

Differential Pressure

Differential Pressure