EMF Meters

This is a concise summary of the Society for Psychical Research (SPR)'s guide to EMF meters. I will add to these notes later on.

What They Measure

  • EMF = electromagnetic fields, natural or man-made (radio, microwaves, phones, light, etc.).

  • Investigators use EMF meters to measure environmental fields — not to detect ghosts.

Choosing an EMF Meter

  • Avoid “lights and sounds only” meters — pick one with proper units (milliGauss mG or microTesla µT).

  • Ideal range: ~20 Hz to 1 kHz (smaller range = more accuracy).

  • Three-axis meters = more accurate (no alignment needed).

  • Single-axis meters must be aligned with the EMF field.

  • Data-logging meters = best for long-term measurements.

  • Test mains vs. battery power — adaptors can introduce errors.

  • If possible, choose a meter that gives both frequency (source ID) and amplitude (strength).

Using the EMF Meter

  • Keep well away from electrical appliances, wiring, and even your own body.

  • Avoid handheld use; if necessary, hold it away from your body.

  • Move meter slowly if sweeping an area.

  • Align sensor with EMF direction (check manual/casing for sensor position).

  • Spot readings are rarely useful — collect baseline data over time.

  • Best practice: start baseline logging early and continue through the entire investigation.

Safety Warning ⚠️

  • Never tamper with electrical wiring or appliances.

  • Suspect a fault? Call a qualified electrician.

EMF-Emitting “Ghost Gadgets”

  • Many devices claim to attract or detect spirits via EMF.

  • Designs range from gothic props to toys; popularized by TV shows.

  • No scientific proof that any such device detects or enhances paranormal activity.

  • Often overpriced and based on exaggerated claims.

Electromagnetism Basics

  • EMF = two linked fields: electric + magnetic.

  • Properties:

    • Frequency (Hz): “fingerprint” that identifies the source.

    • Amplitude (strength): tells you how strong, not what it is.

    • Polarisation: direction where field is strongest.

  • Strength decreases with distance; affected by materials, reflections, and attenuation.

  • Exists around metal objects, water pipes, building structures — and living organisms (cells generate EMFs).

Best Practices

  • Always check manufacturer specs for meter capability + sensor location.

  • Use only for intended purpose: measuring EMF, not as ghost detectors.

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