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Testo 420 Flow Hood – Airflow Meter HVAC for Air Velocity, Volume Flow, Temperature, and Relative Humidity – CFM Meter for Airflow HVAC with Tiltable Display, Bluetooth, and App Compatibility

  • Based on 12 reviews
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Availability: Only 5 left in stock, order soon!
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Arrives Friday, Oct 3
Order within 16 hours and 58 minutes
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Style: Flow Hood with NIST


Features

  • Lightweight & Ergonomic; Weighing less than 6.4 lbs, the 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 testo 420 flow hood 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 HVAC Airflow Meter CFM 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, & 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 air flow meter are met

Description

The 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 Testo 420: 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 gBattery life: 40 hoursDelivery 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 (and 1x NIST if selected)

Product Dimensions ‏ : ‎ 31.5 x 26.77 x 12.2 inches; 11.26 Pounds


Item model number ‏ : ‎ 420 KIT


Date First Available ‏ : ‎ March 10, 2017


Manufacturer ‏ : ‎ Testo


Country of Origin ‏ : ‎ China


Best Sellers Rank: #118,687 in Industrial & Scientific (See Top 100 in Industrial & Scientific) #274 in Flowmeters


#274 in Flowmeters:


Customer Reviews: 4.4 4.4 out of 5 stars 12 ratings


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Friday, Oct 3

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Top Amazon Reviews


  • Awesome Flow hood!
Style: Flow Hood with NIST
Great piece of equipment!
Reviewed in the United States on March 12, 2025 by Tony D

  • NOT actually NIST Certified
Style: Flow Hood with NIST
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.
Reviewed in the United States on March 12, 2020 by Nick

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