Digital Pocket Thermometers, also known as Instant Read Thermometers, are used to Measure the Internal Temperature of foods;
To use the stem is inserted into the food, producing an instant temperature readout. Instant-read thermometers are not ovenproof and cannot be left in food during cooking. They are used instead to test temperatures periodically towards the end of anticipated cooking times.
Ovenproof Thermometers can remain in foods as they cook.