N pole on every body-facing surface
On all Tianling models the surface that touches the body is the N pole (north-seeking pole). The reason is consistency: if polarity varies between models, the same product behaves differently from one wear to the next.
How to check it at home
- Get an ordinary magnetic compass.
- Bring the compass close to the body-facing surface of the product.
- If the S pole of the needle (usually the uncoloured end, or the end marked "S") is pulled toward the surface, that surface is the N pole.
No special instrument is needed. Publishing how to check is more useful than simply stating "it is N pole", and it is how we think this category should be sold.
Field strength is decided by distance
Measured values first published July 2016. 1 G = 0.1 mT
| Condition | Field strength | In mT | Note |
|---|---|---|---|
| At the magnet surface (0 cm) | 1,500 G | 150 mT | Bare skin, or one thin layer between magnet and skin |
| Through one layer of fabric | 250 G | 25 mT | Underwear or a thin base layer — the normal wearing condition |
| 5 cm away | 10 G | 1 mT | Worn over several layers, or sitting loose on the body |
| 25 cm away | 1 G | 0.1 mT | Off the body; any effect is negligible at this distance |
The practical conclusion: worn over several layers, you are in the lower rows of that table. Even for warmth, the intended wearing position is on bare skin or over one thin layer.
Materials and construction
| Item | Specification | Note |
|---|---|---|
| Magnetic material | Rare-earth neodymium magnets (NdFeB) | Sintered rare-earth magnets: strong in a small volume, but sensitive to heat |
| Magnet form | Wide magnetic strips | Covering an area rather than points makes the product tolerant of slight misalignment |
| Typical field strength | 1,600–1,800 G at the magnet surface | Varies by model; check the figure on the product listing |
| Polarity | N pole on every body-facing surface | Consistent across the range |
| Magnetic ageing | About 5% per 100 years, per technical documentation | Heat is the one real weakness: direct sun, tumble drying and ironing accelerate loss sharply |
We do not use the term "medical grade". There is no legal standard behind that phrase in the EU, the US, the UK or China. It sounds reassuring but cannot be substantiated after purchase. Tianling describes only measurable properties: material, field strength, polarity and construction.
Ten Chinese patents
Every publication number is listed. Search any of them on Google Patents to verify independently
| Publication No. | Title | Filed | Published |
|---|---|---|---|
| CN107648737A | Compact rotating magnetic device | 2017-10-31 | 2018-02-02 |
| CN107715304A | Fixed knee magnetic support with N pole facing the body, and method of manufacture | 2017-10-31 | 2018-02-23 |
| CN107898212A | High-penetration magnetic mattress based on a spatial N-pole field, and method of manufacture | 2017-10-31 | 2018-04-13 |
| CN107899137A | Eye and face care device with N pole facing the body, and method of manufacture | 2017-10-31 | 2018-04-13 |
| CN109966648A | Wearable device with a built-in rotating magnetic head, and method of manufacture | 2019-04-03 | 2019-07-05 |
| CN109999349A | Compact, quiet, high-performance rotating magnetic head assembly | 2019-03-28 | 2019-07-12 |
| CN110038224A | Mattress, pillow and cushion with a built-in rotating magnetic head, and method of manufacture | 2019-04-09 | 2019-07-23 |
| CN305061970S | Magnetic pillow (design registration) | — | 2019-03-12 |
| CN305133751S | Magnetic knee support (design registration) | — | 2019-04-30 |
| CN206715051U | Handheld rotating magnetic device | 2016-12-29 | 2017-12-08 |
The applicant on all ten is Hangzhou Tianning Health Management Co., Ltd. Grant status varies by jurisdiction and follows each patent office's own register. This site therefore lists publication numbers only and does not claim "granted" status.