IP68 protection provides the highest level of protection against dust and water. The number 6 means that the device is fully protected against dust ingress. Number 8 indicates that the thermal imager is capable of withstanding permanent immersion in water under conditions specified by the manufacturer, which may include depths greater than 1 metre. IP68 rated thermal imaging cameras are designed for use in extreme conditions, including underwater inspections, heavy industry or other applications where maximum protection is required.