What mean of IP68 or IP69k for electronic device?
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)