testo 445 - climate measuring instrument

Order-Nr.  0560 4450

  • Multi-function climate measuring instrument: measure up to 6 measurement parameters at the same time

  • Internal reading memory for up to 3,000 readings

  • Automatic allocation of the duct cross-section to the measuring location (max. 99 measuring locations)

  • Automatic mean value calculation and determination of the volume flow

You can keep a close eye on indoor air quality with the testo 445 climate measuring instrument: the allrounder can measure up to 6 parameters (with the appropriate probe), which can help you make a professional assessment of indoor air quality. The climate measuring instrument therefore supports you in adjusting and checking ventilation and air conditioning systems.

This meter uses a sensor to start up.

Click here for filter selection.

Price on Request

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
  • Temperature
  • Relative air humidity
  • Dew point
  • Absolute humidity
  • Degree of humidity
  • Enthalpy
  • Pressure
  • 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

-50 to +150 °C


±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)


0.1 °C (-50 to +150 °C)

Temperature - TC Type K (NiCr-Ni)

Measuring range

-200 to +1370 °C


±0.3 °C (-60 to +60 °C)

±(0.2 °C + 0.5 % of mv) (Remaining Range)


0.1 °C (-200 to +1370 °C)

Temperature - TC Type J (Fe-CuNi)

Measuring range

-200 to +1000 °C


±0.5 °C or ±0.5 % of mv


0.1 °C (-200 to +1000 °C)

Humidity - Capacitive

Measuring range

0 to 100 %RH


See probe data


0.1 %RH (0 t1 +100 %RH)

Velocity - Vane

Measuring range

0 to 60 m/s


See probe data


0.01 m/s

Ambient CO₂

Measuring range

0 to 10000 ppm

0 to 1 Vol.%


±(100 ppm + 3 % of mv) (5000 to 10000 ppm)

±(500 ppm + 2 % of mv) (1 to 5000 ppm)

Vol %: see probe data


1 ppm

0.0001 Vol.%

Velocity -Thermal anemometer

Measuring range

1 to +20 m/s


See probe data


0.01 m/s (1 to 10 m/s)

0.1 m/s (10.1 to 20 m/s)

Ambient CO

Measuring range

0 to 500 ppm


±5 % of mv (100 to 500 ppm)

±5 ppm (0 to 100 ppm)


1 ppm (0 to 500 ppm)

Pressure measurement

Measuring range

See pressure probes


±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


215 x 68 x 47 mm

Operating temperature

0 to +50 °C



Battery type

9V block battery, 6F22

Battery life

45 h

Display type


Display size

4 lines

Data transfer



3,000 measuring values

Storage temperature

-20 to +70 °C


255 g


Rs  5,369.00
GST and accessories extra
Rs  13,744.00
GST and accessories extra
Rs  70,554.00
GST and accessories extra
Rs  34,363.00
GST and accessories extra
Rs  13,721.00
GST and accessories extra
Rs  12,051.00
GST and accessories extra
Reference humidity/temperature probe

Order Number: 0636 9741

Price on Request
Precision pressure probe, 100 Pa

Order Number: 0638 1345

Price on Request
Pressure probe, 10 hPa,

Order Number: 0638 1445

Price on Request
Pressure probe 100 hPa

Order Number: 0638 1545

Price on Request
Price on Request


Accessories for temperature probes

Rs  1,312.00
GST and accessories extra

Accessories for velocity probes, pressure probes

Handle for plug-in vane probes

Order Number: 0430 3545

Price on Request
Rs  4,295.00
GST and accessories extra

Accessories: Humidity probes

Connection cable

Order Number: 0430 0143

Rs  4,993.00
GST and accessories extra
Rs  7,656.00
GST and accessories extra

Additional accessories and Spare parts

9V rech. battery for instrument

Order Number: 0515 0025

Rs  1,432.00
GST and accessories extra
Handle for plug-in measuring tip

Order Number: 0600 5593

Price on Request

Caps for humidity probes

Stainless steel sintered cap, Ø 21 mm

Order Number: 0554 0640

Price on Request
Price on Request
Rs  4,818.00
GST and accessories extra
Cap with wire mesh filter, Ø 12 mm

Order Number: 0554 0757

Price on Request

Printer and accessories

Label thermal paper (Testo patent)

Order Number: 0554 0561

Price on Request
Rs  2,625.00
GST and accessories extra

Software and Accessories

RS232 cable

Order Number: 0409 0178

Rs  6,546.00
GST and accessories extra

Transport and Protection

Rs  9,426.00
GST and accessories extra