testo 420 Differential Pressure Manometer

The CEC compliant testo 420 differential pressure measuring instrument is suitable for accurate differential pressure measurement up to 120 Pa, suitable for checking filters in HVAC systems. The testo 420 calculates flow velocity and volume flow. This instrument can also be used for absolute pressure measurement.

Differential Pressure Measuring Instrument with Practical Functions

You can use a pitot tube and compatible connection hoses (both optional) to measure the flow velocity and volume flow in ventilation ducts. Timed and multi-point mean calculation, as well as the combination of the two, together with simple input of the duct geometry, provide you with accurate flow measurements in ducts.

Automatic zeroing ensures higher accuracy for low pressures. All measuring values are easy to read on the large backlit display.

Documenting the Measurement Data

Measurement data can be stored in the testo 420 for analysis and documentation. It's easy to manage the measurement data on a PC without any additional software, via the testo 420's plug and play capability.

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Differential Pressure

Differential Pressure	Measuring range -0.480 to 0.480 InH₂O / -120 to +120 Pa +19.7 to +2756 fpm / +0.1 to +14 m/s
	Accuracy ±2 % of mv + 0.002 InH₂O at +72 °F, 405 InH₂O / ±2 % of mv + 0.5 Pa at +22 °C, 1013 hPa
	Resolution 0.001 InH₂O / 0.001 Pa 0.01 fpm / 0.01 m/s
	Reaction time 1 sec (t90)

Absolute Pressure

Absolute Pressure	Measuring range 280 to 440 InH₂O / 700 to 1100 hPa
	Accuracy ±1 InH₂O / ±3 hPa
	Resolution 0.1 InH₂O / 0.1 hPa
	Reaction time 1 sec

General technical data

General technical data	Dimensions 6 x 3 x 1 in. / 150 x 85 x 35 mm
	Operating temperature 23° to 122 °F / -5 to +50 °C
	EU-/EG-guidelines EU-guideline 2014/30/EU
	Battery type Alkaline, type AA
	Battery life 40 h
	Display size 3.5"
	Display function Dot matrix
	Display ligthing with illumination
	Interface Micro-USB
	Memory 2 GB (internal)
	Storage temperature -4° to 140 °F / -20 to +60 °C