Pocket thermometers are useful for many purposes, such as checking the temperature of food, water, air, or body. They are easy to carry and operate and can provide accurate readings in seconds.

Digital thermometers are more accurate, faster, and easier to use than traditional thermometers that rely on mercury or alcohol. Digital thermometers can be used for various purposes, such as measuring food temperature, room temperature, etc.

An oven thermometer is a device that measures the temperature inside an oven. It is useful for checking the accuracy of the oven's thermostat, ensuring even heating, and preventing overcooking or undercooking of food. 

A fridge freezer thermometer can be useful for monitoring the performance and efficiency of a fridge or freezer, as well as for complying with food safety regulations and standards.

There are different types of meat thermometers, some are designed to be inserted into the thickest part of the meat before cooking, while others can be used to check the temperature during or after cooking. A meat thermometer can prevent overcooking, undercooking, and foodborne illnesses caused by bacteria such as Salmonella and E. coli.