The testo 420, accurate and lightweight flow hood with Bluetooth is the precise and convenient solution for measuring volume flows at supplies and returns. Now available with the option of a NIST certification, for documented accuracy. Handling this capture hood with flow straightener and tiltable display is especially easy with its ergonomic handles and a weight of less than 6.2 lbs.!
• The capture hood with flow straightener significantly improves measurement accuracy, saving you time and headaches for those difficult situations
• The display can be tilted for a more comfortable readout
• Bluetooth allows for connection to mobile devices, which can be used as a second display or remote control
• The App can be utilized to finalize and send measurement reports while still on site
• Use of an optional tripod is especially easy for high ceilings| Humidity - Capacitive |
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| | Measuring range | 0 to 100 %rH |
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| | Accuracy | ±1.8 %rH + 3 % of mv at +77 °F / ±1.8 %RH + 3 % of mv at +25 °C
(5 to 80 %rH) |
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| Differential Pressure |
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| | Measuring range | -0.480 to 0.480 InH2O / -120 to +120 Pa |
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| | Accuracy | ±2 % of mv + 0.002 InH2O at +72 °F, 405 InH2O / ±2 % of mv + 0.5 Pa at +22 °C, 1013 hPa |
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| | Resolution | 0.001 InH2O / 0.001 Pa |
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| Absolute Pressure |
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| | Measuring range | 280 to 440 InH2O / 700 to 1100 hPa |
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| | Accuracy | ±1 InH2O / ±3 hPa |
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| | Resolution | 0.1 InH2O / 0.1 hPa |
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| Volume flow |
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| | Measuring range | 24 to 2354 CFM / 40 to 4000 m³/h |
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| | 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) |
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| Delivery Scope | 0563 4200 -- testo 420 accurate, lightweight flow hood base with Bluetooth; USB cable, batteries, soft case w/ telescoping handle and wheels
400563 4200 -- testo 420 accurate, lightweight flow hood base with Bluetooth; USB cable, batteries, soft case w/ telescoping handle and wheels, and NIST certificate
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Product Family
All orders are shipped same-day if the order is received by 1:00 PM Central Time. We ship worldwide.
UPS Hoilday Delivery Schedule
For more infomation about Returns visit Returns
For more informatrion about Warranty visit Warranty page.
You can also find answers to some common questions on our FAQ page
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