# Best EMF Meters And Detectors > Independent Testing & Reviews ## Posts - [Building Biology Standards (SBM-2015), Explained](https://www.libertyjs.com/building-biology-standards-sbm-2015-explained/): SBM-2015 is the measurement standard used by building biologists, consultants who inspect homes for clients who want their exposures as low as reasonably achievable. For EMF, it grades sleeping areas into four bands, from “no anomaly” up to “extreme,” using targets hundreds to thousands of times stricter than the official FCC and ICNIRP limits. Here is the important part to understand up front: SBM-2015 is a precautionary philosophy, not a set of health limits. It does not claim that official levels cause harm, and it was not derived the way government limits are. This page explains what the standard actually says, […] - [What Is a Normal EMF Reading in a House?](https://www.libertyjs.com/what-is-a-normal-emf-reading/): There is no single normal reading. What there are, and what this page publishes, are the ranges I actually find when I measure. Every number below comes from real measurements in real homes, mine plus the homes of friends and family who ask me to measure theirs, logged with meter, mode, distance, and time. It is a small sample, not a survey, so treat it as a set of examples rather than a national average. Read it as a reference point rather than a standard. Your home will differ, which is the entire reason to own a meter, and the comparison […] - [How to Read an EMF Meter: What the Numbers and Units Mean](https://www.libertyjs.com/how-to-read-an-emf-meter/): How to Read an EMF Meter: What the Numbers and Units Mean The numbers on an EMF meter tell you how strong a field is at the exact spot where the meter sits. There are only three unit families you need to know: µW/m² for radio-frequency (RF) signals, mG for magnetic fields, and V/m for electric fields. Once you can read those three, every screen on every home meter makes sense. This is the reference page for the whole site. Every reading I publish uses these units, so bookmark this one and come back whenever a number looks unfamiliar. First, Know […] - [What Is an EMF Meter and Which Type Do You Need?](https://www.libertyjs.com/what-is-an-emf-meter/): An EMF meter is a handheld device that measures electromagnetic fields, the invisible energy given off by things like WiFi routers, power lines, phone chargers, and kitchen appliances. Instead of wondering how much is around you, a meter puts a number on it. There are three main types: RF meters, magnetic field meters, and electric field meters. All-in-one meters combine all three in one box, and for most people, that is the right first purchase. I will walk you through what each type actually detects, show you real readings from my own home, and help you figure out which one fits […] - [Meter Frequency Range: Why It Matters and What You Miss Without It](https://www.libertyjs.com/meter-frequency-range-why-it-matters-and-what-you-miss-without-it/): An RF meter can only report signals inside the frequency range its antenna is built for, and that range is printed on the spec sheet in MHz and GHz. If a device transmits outside your meter’s range, the meter shows a low number or nothing at all, not because the signal is absent, but because the meter cannot see it. Frequency range is the single most important spec on an RF meter, and it is the one most people never check. Here is how to read the spec, where common household signals sit, and what the meters most people own can […] - [RF vs. Magnetic vs. Electric Fields: What's the Difference?](https://www.libertyjs.com/rf-vs-magnetic-vs-electric-fields/): A home has three different kinds of EMF, and they are not the same thing wearing different names. RF fields come from wireless signals, magnetic fields come from flowing current, and electric fields come from voltage sitting in a plugged-in cord. Each comes from a different source, needs a different meter setting, and behaves differently once you start measuring it. Mixing them up is the most common beginner mistake there is. Here is how to tell them apart, with real readings of all three taken in the same room. Why This Distinction Matters Most people say “EMF” like it is one […] - [How EMF Weakens With Distance (Measured at 1, 3, and 10 Feet)](https://www.libertyjs.com/does-emf-get-weaker-with-distance/): Distance is the single most effective way to lower an EMF reading, and it costs nothing. I measured a WiFi router, a running microwave, and a lamp cord at set distances, running the full series on my TriField TF2 and repeating it on my other meters to check the pattern held. Every one of them dropped fast as I stepped back. Step-by-step: this article shows the actual numbers, so you can see how much stepping back really does before you spend a dollar on anything. Why Distance Works So Well Picture a flashlight in a dark room. Right up close, the […] - [What Is EMF? Ionizing vs. Non-Ionizing, in Plain Words](https://www.libertyjs.com/what-is-emf/): EMF stands for electromagnetic field. It is energy that travels through space around anything electrical or wireless: your phone, your WiFi, your wiring, the power lines outside. All EMF falls into one of two categories, and the difference between them matters more than anything else on this topic. Ionizing radiation, like X-rays, carries enough energy in a single wave to knock electrons loose and break molecules apart. Non-ionizing radiation, which is everything in your home, doesn’t carry enough energy per wave to do that. Whether it can cause damage some other way is a separate question, and researchers are still working […] - [Single-Axis vs. Three-Axis Meters](https://www.libertyjs.com/single-axis-vs-three-axis-meters/): A three-axis meter measures a field from all three directions at once and combines them into one number. A single-axis meter measures in only one direction, so you have to rotate it to find the strongest angle. Both can give accurate readings; the difference is how much work you do and how easy it is to get a misleading number. For walking around a home, three-axis is the one to want, and it is what I recommend for beginners. Here is how each works, why your reading changes when you rotate a meter, and when a single-axis meter is actually the […] [comment]: # (Generated by Hostinger Tools Plugin)