testo 445 - Climate measuring instrument

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Multi-function climate measuring instrument: measure up to 6 measurement parameters at the same time <br>Internal reading memory for up to 3,000 readings <br>Multi-function climate measuring instrument: measure up to 6 measurement parameters at the same time <br>Automatic mean value calculation and determination of the volume flow


Product Description

Ventilation and air conditioning systems are used more and more frequently to ensure user independent fresh air supply and thermal comfort in buildings. The testo 445 climate measuring instrument helps you check the system is functioning properly and operating efficiently. This is because the measuring instrument can determine all the relevant measurement parameters for you.

 testo 445 climate measuring instrument: an overview of the advantages 

The testo 445 climate measuring instrument has two inputs for connecting external probes (which can be ordered separately). At Testo, you have a large selection of suitable probes for the testo 445 climate measuring instrument. Depending on which probe you decide on, you can determine the following parameters:

     Air velocity (in ventilation ducts, at duct outlets and on extractors) 
     Volume flow 
     Relative air humidity 
     Dew point 
     Absolute humidity 
     Degree of humidity 
     CO in indoor air 
Further practical features of the climate measuring instrument: its internal memory records up to 3,000 readings. The automatic allocation of the duct cross-section is also particularly useful. This means you can save the measurement data so that it is linked to the measuring location (up to 99 measuring locations). The mean value, the last measured value and the min./max. values can be displayed simply by pressing a key. 
As optional accessories for the climate measuring instrument, we recommend you get the testo fast printer to print data out directly at the measuring location and the ComSoft software for convenient data analysis on the PC.

Delivery scope

testo 445 climate measuring instrument, including battery and calibration protocol.

Temperature - NTC

Measuring range
0 to 100 %RH
Resolution 0.1 %RH (-50 to +150 °C)
Accuracy  ±0.5 % of mv (+100 to +150 °C)
 ±0.2 °C (-25 to +74.9 °C)
 ±0.4 °C (-50 to -25.1 °C)
 ±0.4 °C (+75 to +99.9 °C)
Resolution  0.1 °C (-50 to +150 °C)


Temperature - TC Type K (NiCr-Ni)

Measuring range
 -200 to +1370 °C
Resolution 0.1 °C (-200 to +1370 °C)
Accuracy ±0.3 °C (-60 to +60 °C)
 ±(0.2 °C + 0.5 % of mv) (Remaining Range)


Temperature - TC Type J (Fe-CuNi)

Measuring range
 -200 to +1000 °C
Resolution 0.1 °C (-200 to +1000 °C)
Accuracy ±0.5 °C or ±0.5 % of mv


Humidity - Capacitive

Measuring range
0 to 100 %RH
Resolution 0.1 %RH (0 t1 +100 %RH)
Accuracy  See probe data


 Velocity - Vane

Measuring range
0 to 60 m/s
Resolution  0.01 m/s
Accuracy  See probe data


Ambient CO?

Measuring range
0 to 10000 ppm
 0 to 1 Vol.% 
Resolution 1 ppm
Accuracy ±(100 ppm + 3 % of mv) (5000 to 10000 ppm)
 ±(500 ppm + 2 % of mv) (1 to 5000 ppm)
Vol % see probe data


Velocity -Thermal anemometer 

Measuring range
1 to +20 m/s
Resolution  0.01 m/s (1 to 10 m/s)
 0.1 m/s (10.1 to 20 m/s)
Accuracy See probe data


Ambient CO

Measuring range
0 to 500 ppm 
Resolution 1 ppm (0 to 500 ppm)
Accuracy ±5 % of mv (100 to 500 ppm)
 ±5 ppm (0 to 100 ppm)


Pressure measurement 

Measuring range
See pressure probes
Accuracy  ±0.001 hPa (Probe 0638 1345)
 ±0.001 hPa (Probe 0638 1445)
 ±0.01 hPa (Probe 0638 1545)
 ±1.0 hPa (Probe 0638 1645)


General Technical Data
Weight 255 g
215 x 68 x 47 mm
Operating temperature 0 to +50 °C
Housing ABS 
Battery type  9V block battery, 6F22
Battery life 45 h
Display type  LCD
Display size 4 lines
Storage temperature  -20 to +70 °C
Data transfer RS232
Memory 3,000 measuring values

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