What is IP Ratings?

IP Ratings definition

IP Ratings or Internal Protection ratings are international standers that refer the level of protection on a device. It refers both object intrusion and moisture.

It consists two digits where first digit refers the intrusion protection and second digit refers moisture protection. The first digit has range from 0 to 6 (No ingress of dust) and second digit has range from 0 to 8 ((Immersion beyond 1m I water). 0 refers no special protection.

So, IP 67 rating means 6 rating for intrusion protection and 7 for moisture protection