What is IP68 rating?

our device has been tested in a controlled environment and certified to be water and dust-resistant in specific situations (meets requirements of classification IP68
as described by the international standard IEC 60529 - Degrees of Protection
provided by Enclosures [IP Code]; conducted in a dust-proof test chamber at 20 -
25 °C, with air pressure close to standard atmospheric pressure, relative humidity
not exceeding 75%, dust particle size not exceeding 75 microns, wind speed of
2 - 3 m/s, and a duration of more than 8 hours. Water resistant test environment:
immersed in water at a depth of 1.5 meters under a pressure of 0.15 MPa for
more than 30 minutes). Despite this classification, your device is not impervious
to water damage in any situation.