Testo 420 Specifications

testo 420 Flow hood

Lightweight, tough and accurate.

Weighs less than 6.2 lbs. (2.9 kg.)

Flow straightener for more precise measurement at

turbulent outlets

Large, tiltable, backlit display (removable)

We measure it.

CFM

fpm

°F

App integration via Bluetooth for fast and easy monitoring

and reporting on site

The new testo 420 flow hood is the light, precise and

convenient solution for regulating volume flows at supplies

and returns. At turbulent outlets in particular, the flow

straightener significantly improves measurement accuracy,

saving you time and headaches for these difficult situations.

Handling is especially easy with the low weight of less than

6.2 lbs. and ergonomic handles.

%RH

Pa

The display can be tilted for more comfortable readout.

In addition, Bluetooth will allow for connection to mobile

devices, which can be used as a second display or remote

control. This makes the use of a tripod (optional) for high

ceilings especially easy. Furthermore, users can utilize the

App to finalize and send measurement reports while still on

site.

www.testo.com/flowhood

testo 420

Technical data

testo 420 set

testo 420 flow hood base, 24" x 24" flow
hood, USB cable, batteries, soft case
w/ telescoping handle and wheels, NIST
Certificate

Part no. 400563 4200

We measure it.

General technical data

Operating temperature 23 to 140 °F (-5 to +60 °C)

Storage temperature -4 to 140 °F (-20 to +60 °C)

Weight

Standard hood

Battery type Type AA

Battery life 30 h

Display Dot matrix with illumination

Memory 2 GB internal

Interface Micro USB

Warranty 2 years

6.3 lbs. (2.9 kg)

24" x 24" (610 x 610 mm)

Sensor types

Volume flow Temperature

Measuring range 50 to 2120 CFM

Accuracy

±1 digit

Resolution .5 CFM 0.1 °

±3 % of m.v.

-4 to 158 °F /

(-20 to +70 °C)

±0.9 °F (32 to 158 °F) /

±0.5 °C (0 to +70 °C)

Humidity sensor

0 to 100 %RH

±1.8 %RH

0.1 %RH

Dierential pressure

0 to 5" H2O /

(0 to 120 Pa)

±2 % of m.v.

0.001 Pa

Functional principle of the flow
straightener.

Flow straightener for significantly
more precise measurements at
turbulent outlets.

Bluetooth App allows for hands
free operation, displaying
measurement data on mobile
devices and finalizing the
measurement report on site.

Sturdy, wheeled tripod (optional)
with central fitting for safe
measuring of high ceiling outlets.