article_snippet: The rating is typically followed by two numbers - the first is the level of dust resistance, the second is water resistance.
article_snippet: Dust resistance ranges from zero to six, and water resistance ranges from zero to nine.
article_snippet: A rating of seven on the waterproof scale means: 'Ingress of water in harmful quantity shall not be possible when the enclosure is immersed in water (up to one metre).'