
A common added feature for electronic thermometers, especially electronic cooking thermometers, is the protection index or waterproof rating. IP
The International Electrotechnical Commission (IEC) has created a standard for rating instruments based on their ability to protect their electronic components from corrosion by water or dust.
The Protection Index (or IP) code is made up of the letters "IP" followed by two numbers.
The first number tells you how to protect an instrument's electronics from penetration by solids (such as dust), and the second number tells you how they stand up against liquids.
With the note IP 54: 5 describes the level of protection against solid objects and 4 describes the level of protection against liquids.
An "X" can be used for one of the numbers if there is only one protection class, i.e. IPX1, which covers protection against vertically falling drops of water, e.g. condensation ...
An IP22-rated socket outlet is protected against
In order to comply with strict CE marking requirements today's machine manufacturers match their machines with parts certified to EU (European Union) and international standards.