testo 435-4 C° RH Co2 CO Lux Flow HPA

The testo 435-4 multifunction instrument allows you to carry out all the measurements that are necessary to check and adjust ventilation and air conditioning systems and assess the quality of the indoor air.  The 435-4 accepts a wide variety of probes to measure and record airflow, humidity, temperature and indoor air quality (IAQ) readings.  With the included ComSoft Software this data can be organized by location, analyzed and reported.

Probe dependent menus and selectable user profiles ensure that the testo 435-4 multifunction meter is always ready to use.  Easy set-up of user defined IAQ and airflow / duct profiles allow for fast measurement of many different tasks, and with a wide variety of probe choices available, the testo 435 is ready to handle a vast array of HVAC / IAQ applications.  The superb data handling will keep your readings organized and ready however you need them, whether in a quick print out on-site or further anaylized and placed in to a report.

Testo 435-4 highlights:

  • Integrated differential pressure measurement for flow, and monitoring HVAC
  • Data recording for 10,000 readings
  • ComSoft PC Software for analyzing, archiving, and documenting data
  • Wireless, or cable humidity probes
  • Optional Light (Lux) probe
  • Optional Comfort level probe
More Information
Warranty 2 Years
General Technical Data
Technical data 

Housing

ABS / TPE / Metal

Protection class

IP65

EU-/EG-guidelines

2004/108/EG

Warranty

2 years

Battery type

3 x AA 1.5 V

Battery life

200 h (typical vane measurement)

Display ligthing

Yes

Memory

10,000 measuring values

Storage temperature

-22° to 158 °F / -30 to +70 °C

Weight

15 oz. / 428 g

Dimensions

9 x 3 x 2 in. / 220 x 74 x 46 mm

Operating temperature

-4 to +122 °F / -20 to +50 °C

Temperature Sensor - NTC
Technical data 

Measuring range

-50 To +150 ° C

Accuracy

± 0.2 ° C (-25 to +74.9 ° C) 
± 0.4 ° ​​C (-50 to -25.1 ° C) 
± 0.4 ° ​​C (+75 to +99.9 ° C ) 
± 0.5% v. Mw. (remaining range)

Resolution

0.1 °C

Temperature Sensor - Type K (TC)
Technical data 

Measuring range

 -200 to +1370 °C

Accuracy

± 0.3 ° C (-60 to +60 ° C) 
± (0.2 ° C + 0.5% v. Mw.) (Remaining range)

Resolution

 0.1 °C

Temperature - TC Type T (Cu-CuNi)
Technical data 

Measuring range

 -200 to +400 °C

Accuracy

± 0.3 ° C (-60 to +60 ° C) 
± (0.2 ° C + 0.5%) (remaining range

Resolution

0.1 °F / 0.1 °C

Humidity - Capacitive
Technical data 

Measuring range

0 to +100 %rH

Accuracy

See probe data

Resolution

0.1 %rH

Absolute Pressure
Technical data 

Measuring range

0 to 800 InH₂O / 0 to 2000 hPa

Accuracy

See probe data

Resolution

0.0 InH₂O / 0.1 hPa

Velocity - Vane anemometer
Technical data 

Measuring range

0 to 11811 fpm / 0 to 60 m/s

Accuracy

See probe data

Resolution

2.00 fpm (Ø 60 mm vane + Ø 100 mm vane) / 0.01 m/s (Ø 60 mm vane + Ø 100 mm vane)
19.7 fpm (Ø 16 mm vane) / 0.1 m/s (Ø 16 mm vane)

Velocity - Hot wire anemometer

Technical data

Measuring range

0 to 3937 fpm / 0 to 20 m/s

Accuracy

See probe data

Resolution

2.00 fpm / 0.01 m/s

Differential pressure (internal sensor) - Piezoresistive
Technical data 

Measuring range

0 to +10 InH₂O / 0 to +25 hPa

Accuracy

±0.01 InH₂O (0 to +1 InH₂O) / ±0.02 hPa (0 to +2 hPa)
±1 % of mv (Remaining Range)

Resolution

0.00 InH₂O / 0.01 hPa

Overload

80 InH₂O / 200 hPa

Light
Technical data 

Measuring range

0 to 100000 Lux

Accuracy

See probe data

Resolution

1 Lux
0.1 Hz

Ambient CO2 (via IAQ probe)
Technical data 

Measuring range

0 to 10000 ppm

Accuracy

See probe data

Resolution

1 ppm

What's Included

Testo 435-4, PC software, USB Cable, batteries, and conformity certificate

 

Integrated differential pressure measurements for flow velocity

Optional probes for multiple measurements 
(Light, Turbulance, pressure, Temperature, Humidity, Co2,Velocity) 

Backlit LCD for easy viewing

Built-in memory stores up to 10,000 measurements