In addition to immersion and penetration of the long, pointed probe shaft in liquids and soft or powdery substances being possible, you can also insert it in ventilation ducts to measure the temperature there. This penetration thermometer is also a winner when it comes to accuracy, because it achieves a higher level than typical comparable models.
A really user-friendly penetration thermometer
The testo 905-T1 penetration thermometer is easy to use and very user friendly. The measuring values are shown very legibly on the display. The fact that the display can be pivoted also makes reading easier. This is particularly practical, since the measuring values can be read off perfectly, from many different perspectives.