The product is the test. Meters are instruments only. Every verdict comes from a paired measurement — same source, same meter, same distance, same mode — judged against thresholds we publish in advance.
The only fair way to judge an EMF protection product is to make it the single variable. We fix the source, the distance, and the meter — then the product either moves the number or it doesn't.
We measure the source — a router, a phone, a smart meter — with the product removed. Same meter, same distance, same operating mode. Three stable readings on this half, so drift can't masquerade as an effect.
The product goes in exactly as its instructions say to use it. Nothing else changes. Three stable readings on this half. Both numbers — that pair is the entire test.
The percentage change between the two readings is compared against the thresholds below — thresholds we published before testing, so no product gets a moved goalpost.
| Verdict | Measured change | What it means |
|---|---|---|
| ✅ Works | Reduction of 80% or more | A large, unambiguous drop. The product does what shielding physics says a working product should do. |
| 🟡 Partial | Reduction of 20–79% | A real, measurable effect — but check the exact number against the claim on the box before paying for it. |
| ❌ No effect | Reduction under 20% | Within what normal measurement variation explains. We can't distinguish this product from doing nothing. |
| ⚠️ Backfires | The reading went up | It happens — partial shielding can make a phone transmit harder, and a poorly placed shield can reflect energy back. We publish these too. |
Same paired rule every time — the product is the only variable. The setup follows the claim and how the box says to use it. No invented numbers here: these are the setups, not published results.
Router on. Meter at one locked real-use distance (say 1 ft or 3 ft). Baseline with the guard off, then installed as directed.
Phone on a call. Meter on the body side of the pouch or case. Baseline is the same call, same distance, without the product.
Source on one side, meter on the other. Baseline is an untreated same-size panel — not empty air — so the comparison is the material, not the gap.
Meter at pillow height inside. Open versus closed. Note the seams — that's where a canopy usually leaks.
We only measure the field the product claims to affect. Harmonizers, stickers, and pendants still get a field reading — if the number doesn't move, that's No effect. Not a feelings test.
The Safe and Sound Classic III is an on-camera “is there RF?” check only. We never publish a number from it.
Every product test documents the full setup: the claim, the source and how it was driven, distance, meter and mode, both halves of the pair, the percentage, and the verdict. You can check our math against the thresholds above. We do not require RF, magnetic, and electric on every record — only the field the claim is about.
We avoid medical claims. We publish what was measured, how it was measured, and the limits of the setup. Readers can draw their own conclusions with complete context. New to the units? Start with our plain-English guide to what V/m, mG, and µW/m² actually measure.
Name a product that claims to block EMF, include the claim on the box, and we'll buy it and put it through the paired test.
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