IP Ratings Explained for Wellness Devices: What IPX4 vs IPX7 Actually Means

An IP rating on a spec sheet looks precise and authoritative — two letters, two digits, done. In practice, it is easy to either overtrust it (assuming a rated device can be used however you like) or undertrust it (assuming any rating means "fully waterproof"). Neither is accurate, and the difference matters for a foot therapy mat that might get splashed, or a handheld device that spends its life in a dry room.

What the two digits actually mean

An IP rating has two digits, each independently meaningful. The first digit covers protection against solid objects and dust, ranging from 0 (no protection) to 6 (fully dust-tight). The second digit covers protection against liquid ingress, ranging from 0 (no protection) to 9K (protection against high-pressure, high-temperature water jets — an industrial-grade specification, not something a consumer wellness device typically needs or claims). When only liquid protection is being specified, the first digit is often replaced with an "X" — this is why you commonly see "IPX4" or "IPX7" rather than a full two-digit code, and the "X" does not mean "zero protection," it means "solid-particle protection was not tested or is not being claimed for this specific rating."

The ratings that actually show up on wellness devices

• IPX4 — protected against water splashed from any direction. This covers incidental splashing (a device near a sink or shower that might get spritzed) but does not mean the device can be submerged or directly hosed down.
• IPX5 — protected against low-pressure water jets from any direction. A meaningfully higher bar than splash resistance.
• IPX7 — protected against temporary immersion in water up to 1 meter deep for up to 30 minutes. This is a specific, testable claim, not a general "waterproof" assurance — a device rated IPX7 is not necessarily rated for continuous submersion, or for use in a pool, or for immersion beyond 1 meter.

Why the rating has to match the actual use case, not just sound impressive

A higher number is not automatically "better" for your purposes — it needs to match the actual exposure the device will face. A foot therapy mat used on a bathroom floor genuinely benefits from at least splash resistance (IPX4), since incidental water contact is a realistic scenario. A handheld device that never leaves a dry treatment room gains little practical benefit from a high liquid-ingress rating, and a supplier emphasizing an impressive-sounding rating that has nothing to do with how the product is actually used is worth a second look — it may be a genuine feature, or it may be a spec chosen because it sounds good rather than because it addresses a real use case.

What the rating does not cover

An IP rating addresses ingress protection specifically — dust and water getting into the enclosure. It says nothing about the device's electrical safety more broadly, its thermal performance, or its structural durability from drops or impacts. A device can have an excellent IP rating and a poor overall build quality, or vice versa; these are separate specifications that happen to both appear on the same spec sheet.

What to verify when a supplier states an IP rating

As with any spec claim covered in our spec-sheet reading guide, ask for the third-party test report behind the stated rating, not just the rating itself — IP testing follows a defined standard (IEC 60529) with a specific test procedure, and a legitimate rating should have a test certificate behind it rather than being an internal, unverified claim. It is also reasonable to ask whether the rating applies to the device as sold (fully assembled, with any covers or seals in place) or only to a bare component tested in isolation — a rating on an internal component does not necessarily carry over to the complete, assembled product.