The primary difference is that IPX5 protects against spraying water (water jets), while IPX7 protects against full immersion in water.
Choosing the right one depends entirely on whether your device will face moving streams of water or accidental drops into a pool or tub. Surprisingly, these ratings are not cumulative—an IPX7 device is not automatically guaranteed to pass an IPX5 water jet test. Quick Comparison IP Ratings Decoded: IP57, IPX7, IPX5 Explained
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