This code consists of the letters “I” “P” followed by two digits. The first digit references solids protection, which ranges from 0 to 6. The second digit refers to liquids protection and ranges from 0 to 8. As an example, a switch rating would appear as IP67. Each number is assigned a specific definition. Based on the chart shown here, a switch rated IP67 specifies solids protection as 6, which means that the switch is totally protected from dust penetration. The second digit specifies the liquids protection level as 7, which means the switch is protected against effects of immersion from 15 cm to 1 m (6" to 40") or will pass a water submersion test at 40" (1 meter), for up to 30 minutes. This chart can be found at e-switch.com, under Technical Information on the Home page.