Thermo probe for baking controlThe core temperature probe looks like this - one of the options

Metal needle with a pointed end, and a temperature dial with a temperature run on it from 20 * C to 200-300 * C
What does the temperature probe give?The core temperature probe shows the actual heating temperature inside the dough piece when baking bread.
When the temperature inside the dough reaches 94-98 * C, it means that the dough is baked, the crumb is baked, the bread is ready - the form with bread can be removed from the oven.The temperature probe helps baking bread, guarantees 100% quality of baked bread, and the transformation of raw dough pieces into full-fledged bread.
The thermal probe allows you not to keep track of the baking time by the clock, but to focus only on reaching the temperature inside the bread at a temperature of 94-98 * C at which the crumb of bread is completely baked.
You can use the method of checking the readiness of baking with a knitting needle, but this method is deceptive, and does not always show the bread is completely baked, the crumb remains more moist, and sometimes damp.
How to use the core temperature probe?The core temperature probe is inserted into the dough piece (in the form or on the hearth) at the stage when a good hard crust has already formed on it (after about 20-25 minutes from the beginning of baking).
Insert as shown in the photo above with a needle into the middle of the bread.
On the dial, you can track the desired temperature of 94-98 * C, as soon as this temperature is reached, we take out the mold with the finished bread from the oven onto the grate, take out the temperature probe from the bread.
Which core temperature probe should you buy?Thermal probes are different and are used for different purposes - from determining the temperature of milk (35-40 * C), to determine the readiness of various dishes, such as boiled pork, ham, fish in the oven, and to determining the temperature of the crumb of bread (94-98 * C) and determination of the temperature of the crust of bread (130-150 * C).
The simplest and most practical temperature probe is shown in the photo above.
I suggest choosing temperature probes with a run-up temperature from 20 * C to 200-300 * C - this is the temperature that is used in everyday life, in the kitchen for different situations of its measurement.
Use the temperature probe, and you are guaranteed a good result when baking bread in a mold or on a hearth in the oven! 
LONG MOMENTWhy is my 'instant' thermometer so slow to show the temperature of food?There are two types of so-called instant thermometers: dial and digital type of reading the output data. But do they really give out temperature readings instantly? Don't even hope! 
It can take these supposed speed wizards 10 to 30 seconds to get to the top, which is of course the number you need to see. If you take it out of the food before it reaches its maximum value, you will not be able to know the exact temperature.Of course, you want to get a read as soon as possible. You don’t want to stand with your hand in the oven until this “instant” (and in fact, very slow) thermometer decides to show the actual temperature inside your roast. But the sad truth is that 
no thermometer can show the temperature of the food until it itself — the thermometer, or at least its sensor — reaches the temperature of the food into which it was lowered. In fact, you could say that the only thing a thermometer can do is show you its own temperature.There is little you can do about the time it takes for a thermometer to reach product temperature, other than choosing a digital thermometer rather than a pointer thermometer, because, as I will explain below, digital thermometers are faster than pointer thermometers.
What you really can do is find out exactly where in the food you measure the temperature. The two types of "flash" thermometers differ significantly in this respect.
Pointer thermometers - temperature probe the temperature is measured with a bimetallic coil located in the rod: the coil is made up of two different metals connected together. As the two metals expand when heated at different rates, the heat turns the coil, which in turn turns the needle on the dial. Unfortunately, the coil of the temperature sensor is usually more than 2.5 cm long, so in reality you are measuring the average temperature in most of the product. But often you need to be able to measure the local temperature. For example, inside a roasted turkey, the temperature varies slightly from place to place, but to check the degree of doneness, you must know the specific temperature in the thickest part of the thigh of the bird.
Digital thermometeron the other hand, it measures the temperature at one specific point in the product. It contains a tiny semiconductor that is powered by batteries and whose electrical resistance changes with temperature (technically a thermistor). A computer chip converts resistance into electrical signals that drive a digital display. Since a tiny thermistor is located at the end of the sensor, the digital thermometer is especially good for observing a steak or grilled chop, for example when you need to know the temperature inside a food being cooked.
Another advantage of digital thermometers is that they quickly heat up to the temperature of the food being cooked - due to the small size of the thermometer. This is why they tend to give readings faster than needle-type thermometers.
HOW TO CALIBRATE A CULINARY THERMOMETERCooking thermometers should be calibrated (adjusted) at least once a week or whenever you drop it. Here's how it's done:
1. Fill a glass with crushed ice. Add cold water, mix thoroughly. Place the thermometer in there without touching the bottom or sides of the glass.
2. When the mercury stops moving (usually after thirty seconds), without removing the tip of the thermometer from the glass, tighten the adjusting nut so that the pointer is at the 0 * C mark.
The thermometer can also be calibrated with boiling water by pointing the pointer 
to the boiling point of water corresponding to your altitude.