testo 175T3 - Temperature data logger

The Testo 175T3 temperature logger has a wide measuring range, which  makes it universally applicable. In conjunction with the free ComSoft  software, which allows for fast programming of the logger and detailed  data analysis, the Testo 175T3 can perform targeted checks on the flow  and return temperatures of individual radiators in order to identify any  issues, for example.

  • Practical for frequent and long-term measurements: memory capacity of 1 million readings, up to 3 years’ battery life
  • Very large temperature measuring range from -50 °C to +1000 °C
  • Including wall bracket
  • Measurement  data analysis and documentation: three different software versions to  choose from, basic software available as a free download

Where calibration is required, we can also provide a range of temperature calibrator sources, ideal for verification and ensuring that your measurements are accurate and reliable.

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The testo 175T3 temperature  logger is equipped with two connections for external thermocouple probes  (type T or type K). This means the data logger is ideally suited for  carrying out temperature recording on two channels. This is for instance  necessary, if you want to check that a heating system is working  properly. To do this, the temperature logger measures the flow and  return temperature simultaneously. The data logger can likewise be used  in industrial production control, if process temperatures need to be  checked at different locations.

State-of-the-art measuring technology, high level of data security

You  can select the external thermocouple probes from our wide range of  probes and order them to go with the data logger. This gives you  flexibility and means you can decide yourself exactly what your  temperature logger has to be capable of doing. The range we offer  includes surface probes, air probes and immersion/penetration probes.  The measuring range and accuracy depend on the thermocouple probes  selected. In principle, it is possible to measure from -50 °C to +1 000  °C with an appropriate probe.

You can display the current  measuring values, min./max. values, set limit values, violations of  limit values and remaining battery life on the clear display. This means  you have the opportunity to read important values at any time and do  not need to resort to a read-out of the temperature logger on the PC  straight away every time you want to do a quick data check.

The  long battery life of up to 3 years and the large measurement data memory  which records up to 1 million readings are particularly convenient for  users: because only relatively infrequent reading of the temperature  logger is needed, even with shorter measurement intervals. You can use  standard batteries (AAA) to run the data logger and you can replace them  yourself. Particularly practical when temperatures are to be recorded  in a polluted and dust-laden environment: The temperature logger has  protection against dust ingress as well as water spray and jets  according to protection class IP 65.

Good to know: Saved  measurement data will not be lost even when the battery is empty or  being replaced. You can therefore rely on a high level of data security  when using the temperature logger.

Programming and analysis with the temperature logger

You  can choose between three different software versions for programming  and reading the data logger along with measurement data analysis on the  PC:

  • ComSoft Basic software - can be downloaded free of charge - for fast programming of the data logger and easy measurement data analysis
  • ComSoft Professional software - can be ordered as an option - offers various possibilities for more detailed analysis of the temperature readings
  • ComSoft CFR 21 Part 11 software - can be ordered as an option - suitable for special requirements according to CFR 21 Part 11 in the pharmaceutical sector



testo 175T3 temperature logger, 2-channel temperature logger  with external sensor connections (thermocouple type T and type K),  including wall bracket, lock, batteries and calibration protocol.

Caution: At least one external thermocouple probe (optional) must be connected  to commission the temperature logger. In addition, you also need a USB  cable (optional) in order to programme and read your data logger. You  can order both the probe and USB cable to go with your temperature  logger. You can also transfer the measurement data to your PC using the  USB cable (or with an SD card which is also available as an option).

Testo 175 T3
Temperature logger
Measurement Range
-50 to +1000 °C TC Type K (NiCr-Ni)
-50 to +400 °C TC Type T (Cu-CuNi)
1000000 samples
IP Rating
IP 65
Battery Life
3 years at 15 min. meas. rate
±0.5 °C (-50 to +70 °C),
±0.7 % of mv (+70.1 to +1000 °C) TC Type K (NiCr-Ni)
±0.5 °C (-50 to +70 °C),
±0.7 % of mv (70.1 to +1000 °C) TC Type T (Cu-CuNi)
0.1 °C

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