What mean of IP68 or IP69k for electronic device?

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IP RATINGS SCALE 

First number - Protection against solids

0
No protection.
1
Protected against solid objects greater than 50 mm.
2
Protected against solid objects greater than 12 mm diameter.
3
Protected against solid objects greater than 2.5mm diameter.
4
Protected against solid objects greater than 1.0mm diameter.
5
Dust protected.
6
Dust tight. No Ingress of dust.

Second number - Protection against liquids

0
No protection.
1
Protected against vertically dripping water.
2
Protected against dripping water when tilted up to 15°.
3
Protected against spraying water at an angle of up to 60° from vertical.
4
Protected against splashing water when the enclosure is tilted at any angle up to 15°.
5
Protected against water jets from any direction
6
Protected against heavy seas or powerful jets of water.
7
Protected against the effects of short term immersion (under defined conditions of pressure and time).
8
Protected against submersion (under conditions specified by the manufacturer).
9k
Protected against close-range high pressure, high temperature spray downs.

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