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K-II Meter: Detecting Ghosts or Electromagnetic Fields?

Have you ever watched ghost hunting shows and wondered if those mysterious K-II meters can really detect ghosts? It's a question that's intrigued paranormal enthusiasts for years, and while we can't definitively say whether these devices detect spirits, we can certainly explore how they work and what they actually measure.

EMF vs. Permanent Magnet

First, let's understand the basics. The K-II meter is often associated with detecting Electromagnetic Fields (EMF). EMF is different from a permanent magnet. EMF is generated by changing magnetic fields, creating fluctuations in the electromagnetic environment. Imagine the field oscillating between positive and negative, much like a wave, as long as the device is turned on. On the other hand, permanent magnets are physical objects with a constant magnetic field that doesn't require electricity or motion to maintain. Think of your everyday refrigerator magnet – it's always "on."

Interestingly, you can generate EMF using a permanent magnet by moving it quickly around. This concept forms the basis for many EMF pumps, which involve spinning permanent magnets to create changing magnetic fields.

How the K-II Meter Works

The K-II meter utilizes a coplanar loop as its "sensor." When EMF passes by these loops, it induces a small voltage by moving electrons in the meter. This voltage is then amplified by an Op-Amp (operational amplifier), which serves as an LED driver. The Op-Amp multiplies the small voltage by a factor of 200x, and this amplified voltage is what drives the LEDs on the meter.

Contrary to some claims, the K-II meter doesn't contain an EMF "sensor" in the traditional sense. Instead, it relies on coplanar loops as its sensing component. Think of these coplanar loops as circuits on a circuit board that are sensitive to changes in electromagnetic fields.

The Design Flaw

Now, here's where things get intriguing. The K-II meter employs an LM324 IC (integrated circuit) as its Op-Amp. The datasheet for the LM324 specifies that the IC can withstand negative voltage up to -0.3 volts. However, due to the design of the rectifier in the meter, it allows up to -2.2 volts to pass to the LM324. This can lead to an unstable state where the IC may either go haywire, causing all the LEDs to illuminate for a few seconds, or it might lock up and do nothing for a few seconds.

This design flaw raises questions about the reliability of the K-II meter in the context of ghost hunting, where even the slightest EMF fluctuation is often interpreted as evidence of paranormal activity.


In conclusion, while the K-II meter is indeed capable of detecting electromagnetic fields, its design flaw may cast doubt on its reliability for paranormal investigations. Whether or not it can detect ghosts remains a mystery, and further studies are needed to draw any definitive conclusions.

So, the next time you see a ghost hunter waving a K-II meter around, remember that it's more about measuring electromagnetic fields. The quest to understand the unexplained continues, but for now, the K-II meter's true capabilities remain shrouded in mystery.

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