IP68 is a dust and water resistance rating meaning a device is fully dust-tight and can be submerged in water up to 1.5 meters for 30 minutes under standard test conditions.
IP ratings (Ingress Protection) are standardized by IEC 60529 and describe how well a device is sealed against solids and liquids. The rating consists of two digits: the first indicates dust resistance (6 = fully dust-tight), the second indicates water resistance.
IP68 is the most common premium rating — the device withstood submersion beyond 1 meter in fresh water during manufacturer testing. Most manufacturers test at 1.5m for 30 minutes.
Common IP ratings compared: IP67: Dust-tight, 1m submersion for 30 minutes. IP68: Dust-tight, 1.5m or more submersion for 30 minutes. IPX4: Splash resistant only, no dust rating. IPX5: Water jet resistant.
Important caveats: IP ratings apply to fresh water only. Saltwater, chlorinated pool water, and pressurized water can damage IP68 devices. The rating can also degrade over time as seals wear. Manufacturer warranties typically do not cover water damage even on IP68-rated devices.