There are several types of thermometers used in commercial kitchens. Here are some of the most common types and their uses:

1. Probe Thermometers: These are the most common type of thermometer used in commercial kitchens. They consist of a probe that is inserted into the food being cooked to measure the temperature. They can be used for meats, soups, sauces, and other types of food.
2. Infrared Thermometers: These thermometers use infrared technology to measure the temperature of food without touching it. They are useful for taking quick readings of surface temperatures of grills, fryers, and other hot equipment.
3. Oven Thermometers: These thermometers are designed to be placed in the oven to monitor the temperature. They are useful for ensuring that the oven is calibrated correctly and for making sure that food is cooked at the correct temperature.
4. Fridge/Freezer Thermometers: These thermometers are designed to be placed in fridges and freezers to monitor the temperature. They help ensure that food is being stored at the correct temperature to prevent spoilage.
5. Candy Thermometers: These thermometers are used to measure the temperature of candy, caramel, and other sugary substances that need to reach a specific temperature to be cooked correctly.
6. Surface Thermometers: These thermometers are used to measure the temperature of griddles, hot plates, and other surfaces. They help ensure that the surface is hot enough to cook food correctly.
7. Digital Pocket Thermometers: These thermometers are compact and portable, and are often used by chefs to check the temperature of food during cooking or serving.

By using the appropriate type of thermometer, chefs and kitchen staff can ensure that food is cooked, stored, and served at the correct temperature, reducing the risk of foodborne illness and improving the quality of the food.