What is IP55 or IP58 Rating means?

IP Rating is actually short of  Ingress Protection rating, which means..

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a certification testing to measure a device’s resistance levels to both dust and water. The first digit in the two-digit IP rating indicates the level of protection against solid objects, including dust. The second digit indicates how resistant the device is to water. Here’s what the figures stand for:

The first digit means :
Resistance to solid objects and dust

IP0X: No special protection.
IP1X: Protected against solid objects >50 mm in diameter.
IP2X: Protected against solid objects >12.5 mm in diameter.
IP3X: Protected against solid objects >2.5 mm in diameter.
IP4X: Protected against solid objects >1 mm in diameter.
IP5X: Protected against dust; limited ingress (no harmful deposit).
IP6X: Dust tight.




The Second digit means :
Resistance to water
IPX0: No special protection.
IPX1: Protected against dripping water.
IPX2: Protected against dripping water when tilted up to 15 degrees from normal position.
IPX3: Protected against spraying water.
IPX4: Protected against splashing water.
IPX5: Protected against water jets.
IPX6: Protected against heavy jet spray.
IPX7: Protected against the effects of immersion.
IPX8: Protected against submersion.