The quick-action immersion/penetration thermometer is ideal for measuring the temperature in air, soft or powdery substances and liquids.Fast spot check temperature measurement using a water-tight mini thermometer is an important topic in the food sector. The robust waterproof mini thermometer which after use, for example a temperature spot check on foodstuffs, can be simply cleaned under running water, or in a dishwasher. Temperature monitoring even in bad light is made possible by the large, easy-to-read display. The Hold function freezes the current display value thus enabling the user to note down the reading.