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Overview
Product Highlights
The hood features a unique flow straightener, which significantly improves measurement accuracy, saving you valuable time on difficult tasks 
The testo 420 control unit can be tilted for a more convenient view of the display 
The included Bluetooth / app feature allows for wireless connection to mobile devices, for remote monitoring, as well as remote operation 
The testo 420 app can send measurement reports directly from the work site via email 
For additional convenience, there is an optional tripod when working with high ceilings, as well as four additional flow hood sizes available for complete versatility
The testo 420 is also a CEC approved air flow capture hood
Temperature - NTC
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)
Resolution 0.1 °F / 0.1 °C
Reaction time 45 sec (t90)
Humidity - Capacitive
Measuring range 0 to 100 %rH
Accuracy ±1.8 %rH + 3 % of mv at +77 °F / ±1.8 %RH + 3 % of mv at +25 °C (5 to 80 %rH)
Resolution 0.1 %rH
Differential Pressure
Measuring range -0.480 to 0.480 InHâ‚‚O / -120 to +120 Pa
Accuracy ±2 % of mv + 0.002 InHâ‚‚O at +72 °F, 405 InHâ‚‚O / ±2 % of mv + 0.5 Pa at +22 °C, 1013 hPa
Resolution 0.001 InHâ‚‚O / 0.001 Pa
Reaction time 1 sec (t90)
Absolute Pressure
Measuring range 280 to 440 InHâ‚‚O / 700 to 1100 hPa
Accuracy ±1 InHâ‚‚O / ±3 hPa
Resolution 0.1 InHâ‚‚O / 0.1 hPa
Reaction time 1 sec
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 InHâ‚‚O (50 to 2060 CFM) / 1013 hPa (85 to 3500 m³/h)
Resolution 1 CFM / 1 m³/h
Reaction time 1 sec (t90)
Dimensions 24 x 24 in. (Standard hood) / 610 x 610 mm (Standard hood)
Operating temperature 23° to 122 °F / -5 to +50 °C
