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Penetration thermometer

Penetration thermometers are designed specifically for measurement in liquids and viscoplastic media (meat, fish, dough, etc.). For instance, insertion into yoghurt or milk packaging enables the real core temperatureof the product to be determined.

Penetration thermometers to meet every challenge

This measuring method is very accurate and reliable and is therefore a good method for making an absolutely certain statement about the temperature status of the goods.

However, the disadvantage is that a product that has been "pierced" can no longer be sold and therefore must either be processed as quickly as possible or disposed of.

A Testo thermometer offers you:

  • Robust construction

  • Precise results

  • Intuitive handling

Our thermometers and penetration thermometers

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Measuring correctly with a digital penetration thermometer

For measurements with a probe thermometer, the temperature probe is inserted directly into the measurement object. The measurement is finished when the so-called t99 time is reached. That is the time which a probe needs to achieve 99% of its final value. The 90% value is achieved considerably sooner, but it takes just as long again to get from the 90% value to the 99% value. All data concerning the acclimatization time of temperature probes in Testo documents refer to the t99 time.

Food probes testo 104-IR

Reliable and fast temperature measurement with an insertion thermometer is of particular importance in the food sector. However, in addition to core temperature measurements, it is also a case here of the non-contact measurement of surface temperatures. The testo 104-IR BT combined instrument was specifically developed for this. It combines penetration and infrared thermometers in a compact format.


The infrared penetration thermometer impresses thanks to:

  • precise 2-point laser with 10:1 lens for easy control at a distance

  • fold-out penetration probe for core temperatures

  • particularly robust construction and handy format – when folded away, it fits into any shirt pocket.

testo Smart App

One App for all applications.

The testo Smart App guides you quickly and easily through measurements on refrigeration, air conditioning and heating systems.

Now new:

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Compatible with all Bluetooth-enabled Testo measuring instruments

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