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Testo 420 Flow Hood – Air Flow Meter for Airflow, air velocity, volume flow, temperature, and relative humidity – HVAC Air Flow Meter CFM with Tiltable Display, Bluetooth, and App Compatibility

4.6 (2) Write Review
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$3,363.79

$ 99 .00 $99.00

In Stock
  • LIGHTWEIGHT AND ERGONOMIC; Weighing less than 6.4 lbs, the HVAC CFM air flow meter offers comfortable handling with an ergonomic design and tiltable display, perfect for prolonged use in large spaces or above head height
  • PRECISION MEASUREMENTS; The HVAC air flow meter features a unique volume flow straightener to ensure accurate measurements even at turbulent swirl outlets. It is ideal for precise HVAC system testing and balancing
  • ADVANCED CONNECTIVITY; Equipped with Bluetooth, the CFM meter connects to your smartphone or tablet, allowing for remote monitoring, control, and report generation through the Testo 420 app
  • VERSATILE USE; The detachable control unit doubles as a standalone device for pressure, flow, and volume measurements in ducts by adding optional pitot tubes and hoses. The CFM meter for airflow HVAC provides comprehensive data collection capabilities
  • CONVENIENT REPORTING; Create and email measurement reports directly from the job site via the Testo Smart App, enhancing workflow efficiency and saving valuable time during HVAC inspections and maintenance
  • STANDARDIZED; Take advantage of three calibrated temperature points with the included NIST standards testing certificate. The calibration ensures all regulatory requirements for the instrument are met


testo 420 airflow capture hood - Rapid measurements of airflow in large rooms and swirl outlets
Volume flow is frequently measured at swirl outlets, and airflow measurements are often incorrectly measured due to the turbulent air from these outlets. The testo 420 volume flow capture hood with its removable control unit offers a convenient solution for measurements of flow velocity, volume flow, absolute pressure, temperature and relative humidity in large rooms and swirl outlets. Automatic zeroing ensures a higher accuracy for low pressure.
Technical Data:
TEMP measuring range: -4° to 158 °F / -20 to +70 °C
Accuracy: +-1 °F (32° to 158 °F) / +-0.5 °C (0 to +70 °C) / +-1.4 °F (-4° to 32 °F) / +-0.8 °C (-20 to +0 °C)
Humidity measuring range: 0 to 100 %r H
Accuracy: +-1.8 %rH + 3 % of mv at +77 °F / +-1.8 %RH + 3 % of mv at +25 °(5 to 80 %rH)
Differential Pressure measuring range: -0.480 to 0.480 InH2O / -120 to +120 Pa
Accuracy: +-2 % of mv + 0.002 InH2O at +72 °F, 405 InH2O / +-2 % of mv + 0.5 Pa at +22 °C, 1013 hPa
Absolute pressure measuring range: 280 to 440 InH2O / 700 to 1100 hPa
Accuracy: +-1 InH2O / +-3 hPa
Volume flow measuring range: 24 to 2354 CFM / 40 to 4000 m3/h
Accuracy: +-3 % of mv + 7 CFM at +72 °F / +-3 % of mv + 12 m3/h at +22 °C; 405 InH2O (50 to 2060 CFM) / 1013 hPa (85 to 3500 m3/h)
Dimensions: 24 x 24 in. (Standard hood) / 610 x 610 mm (Standard hood)
Weight: 102 oz. / 2900 g
Battery life: 40 hours
Delivery Scope testo 420:
1 x testo 420 airflow capture hood control unit including USB cable and batteries, 1 x Flow straightener, 1 x Soft-shell protective case
Delivery Scope testo 420 with NIST:
1 x testo 420 airflow capture hood control unit including USB cable and batteries, 1 x Flow straightener, 1 x Soft-shell protective case, 1 x NIST


Tony D
Reviewed in the United States on March 12, 2025
Great piece of equipment!
Nick
Reviewed in the United States on March 12, 2020
I paid extra for this one with NIST certification. It says "Includes NIST Certificate" in the product description but only comes with a factory testing certificate and says "test were obtained using equipment capable of producing results that are traceable thru NIST." NOT a NIST certificate.