IP stands for “Ingress Protection. The Cat S42 is rated as IP68. The “6” in this rating refers to the dust rating. This phone is rated as “Dust Tight” meaning complete protection against dust intrusion as long as all port covers are properly closed.
The 8 in the rating refers to the phone’s ability to be submerged in water. The Cat S42 can be submerged in up to 4 feet of water for 35 minutes as long as all port covers are properly closed.
The MIL-SPEC rating for the Cat S42 is MIL-SPEC 810G making the Cat S42 drop proof to 1.5m (5′), dustproof (when all port covers are properly closed), and vibration proof (Category 4 – Truck/Trailer – Secured Cargo ).