PEMF mat spec sheets throw around Gauss, Hz, and core counts like everyone already knows what they mean. Here's what each term actually refers to, using the real numbers from an actual product line instead of textbook abstractions.
Mechanism Terms
- PEMF (Pulsed Electromagnetic Field): The core technology. A device sends a magnetic field in pulses, rather than a constant field, through the body.
- Gauss: The unit that measures how strong a magnetic field is at the point it's measured. Grooni's mats run 0.5 to 3.5 Gauss across every size, verified against the current product specs.
- Hertz (Hz) / Frequency: How many times the field pulses per second. Grooni's programs span 1 to 100 Hz, grouped into four goal-based ranges: sleep, calm, energy, and relief.
- Tesla / microTesla (µT): Another unit for field strength, more common in clinical literature than Gauss (1 Gauss equals 100 microTesla). Most consumer mat specs, including Grooni's, are listed in Gauss instead.
- Waveform: The shape of each pulse. A sine wave delivers a smooth, continuous pulse; a square wave delivers a sharper, more abrupt one. Grooni's line uses sine wave across every mat.
- Intensity: How strong the field feels during a session, tied directly to the Gauss rating and how close the coil sits to your body.
Device Terms
- Core / Coil: The wound wire inside the mat that generates the magnetic field. More cores spread across a larger surface reach more of the body at once. Grooni's full-body mat uses 6 or 12, the chair mat uses 3, and the mini uses 2.
- Control Unit: The handheld device that lets you pick a program, set a timer, and adjust intensity.
- Preset / Program: A pre-set combination of frequency, intensity, and duration built around a specific goal. Grooni's 13 presets are grouped into four categories: Sleep, Calm, Energy, and Relief.
- Session Timer: The built-in countdown that shuts the mat off automatically once a session ends, so there's nothing to remember to turn off.
- EMF Shielding: A layer that contains the magnetic field to just the frequency you selected, limiting stray electromagnetic output from the device itself.
- Magnetic Field Tester: A small bottle with a loose magnet inside, included with every Grooni mat, that visibly moves when set on the mat during an active session, a simple way to confirm the field is on.
Safety & Usage Terms
- Contraindication: A reason not to use a PEMF device. The standard contraindications are pacemakers and other implanted electronic devices, pregnancy, and active bleeding disorders. For a closer look at the early adjustment period, see our PEMF detox phase guide.
- FDA-Cleared: A regulatory status for specific medical PEMF devices used for conditions like bone non-union and post-operative pain. This status doesn't extend to wellness mats sold for home use, including Grooni's.
- Non-Invasive: A treatment that works through the skin without any cuts, needles, or surgery, standard for all PEMF mats.
- Session Length: How long a single use lasts. Most Grooni programs run 15 to 40 minutes, and the mat shuts off automatically at the end.
Want the fuller picture of how these pieces fit together? See our full explainer on how PEMF mats work.
This article is for educational purposes and is not medical advice. PEMF mats are wellness devices and are not intended to diagnose, treat, cure, or prevent any disease. Consult your healthcare provider with questions about your situation, and before use if you have a pacemaker, implant, or are pregnant.