At an FEI competition, PEMF device-and-accessory pairings are only allowed if they produce less than 1,000 Gauss; certification is how you know yours does.

If your horse competes, meeting that limit is crucial, since a device measuring over the limit will get you into trouble. Using a device that has been certified by Gauss Labs as conforming to FEI standards keeps you clear. FMBs Therapy Systems' PowerMag systems are certified examples in our registry.

The FEI Regulation caps PEMF field strength at 1,000 Gauss.

That rule lives in the FEI's 2026 Veterinary Regulations, Article 1062, which treats a low-frequency PEMF device, whether a magnetic rug, a leg wrap, or a loop, as a non-restricted supportive therapy a horse's own handlers may use, on one condition: its field has to stay below 0.1 Tesla, or 1,000 Gauss. Go above that and the device can't be used at an FEI-sanctioned event. So for a competition horse, peak field strength determines what device you bring.

"FEI compliant" is a claim worth checking.

The FEI sets the limit but doesn't test devices, so a maker can print "FEI compliant" on a spec sheet without those words being tied to any measurement, and that's risky. We measure what a device and its accessory put out as a pair, on our lab test equipment, and record whether the pair stays under the 1,000 Gauss limit, which turns "FEI compliant" from something you take a vendor's word for into a certification you can look up.

FMBs Therapy Systems has device-and-accessory pairs we've certified as conforming to FEI standards.

The UK maker of equine PEMF systems is in our public certification registry, where its PowerMag and PowerMag Pro devices are certified across several equine loops. The status is active and public, so you can read it there instead of taking our word or the maker's.

Whether a given pairing clears the FEI limit depends on the pairing rather than the device alone, since the peak a horse feels comes from the driver and the coil working together. So a certification measures each combination on its own and records which ones stay under the line.

That's what FMBs' certification shows. On both the PowerMag and the PowerMag Pro, the 15-inch loop and the 24-inch butterfly loop are certified as conforming to FEI standards. Whichever system you run, the pairing to confirm is the exact device and loop you'll compete with.

We keep a client's measured field values private, between us and them, and what stays public is the certification and what it covers: the device, the accessory, the standard it was checked against, and the date. For someone choosing a system for a competing horse, that public part is the one that matters.

For a competition horse, the FEI limit is the one spec you can't afford to guess at, and a certification is how you turn a maker's claim into something you, or a steward at the gate, can verify.