How to check a strange meter reading
Part of the PRN Evidence Library
Before you start
Unusual readings on EMF meters, REM pods, thermometers, and similar devices are common. The vast majority have a simple, boring explanation. That is not a reason to dismiss what you noticed — it is a reason to investigate it properly. Work through these steps before drawing any conclusions.
Record the exact reading
Write it down immediately. Note the time, the device model, the location in the room (sketch a rough floor plan if you can), how long the reading lasted, and whether it was a single spike or sustained. Take a photo or video of the display if possible.
A reading you cannot reproduce or describe precisely cannot be evaluated. Documentation is the foundation of everything that follows.
Check for immediate interference sources
Before you move, look around your immediate area.
- Your phone. A mobile phone actively transmitting — sending a message, syncing data, searching for signal — can trigger a K-II meter from across a room. Put all phones in flight mode before continuing.
- Your body. Touching the casing of a K-II meter causes false readings. Hold it by the base only.
- Other devices. Walkie-talkies, baby monitors, wireless routers, and two-way radios all produce electromagnetic fields. Switch them off one at a time and watch the meter.
- Your REM pod. The REM pod emits its own electromagnetic field and detects anything that disturbs it. Any person walking nearby, any warm moist breath, or any conductive object (keys, a belt buckle, another device) moving within range will trigger it. Clear the area completely before re-testing.
Check building-level sources
Many readings trace back to fixed features of the building.
Walk the space and identify:
- Fuse boxes and consumer units. A fridge motor produces 0.5–2 microteslas within 30 cm. A fuse box or distribution board can produce 1–5 microteslas within 1–2 metres.
- Power lines. External cables entering the building, overhead lines outside a window, and in-wall wiring all produce AC fields.
- Large appliances. Fridges, freezers, washing machines, and microwave ovens create localised EMF that drops off quickly with distance.
- Heating and cooling systems. HVAC units, storage heaters, and underfloor heating all cycle on and off, producing both EMF spikes and temperature changes.
Test reproducibility
This is the most important step.
Once you have removed the interference sources you can control, return to the exact same location. Hold the device in the same orientation. Wait.
Does the reading return? Can you make it return by moving to the same spot repeatedly? A reading that only happens once, in one position, that disappears when you step back and cannot be repeated, is far less significant than one that reliably recurs.
If the reading does recur in the same spot with interference removed, note the precise location and conditions. That is worth documenting properly.
For temperature anomalies — check air movement
Most apparent cold spots have a physical source.
- Hold a lit incense stick or a piece of tissue paper near the area and watch for movement. Even a gentle draught invisible to you will show up.
- Check for gaps around window frames, skirting boards, and floorboards. Old buildings have thermal bridging — areas where cold transfers through the wall structure, creating a cold patch with no airflow at all.
- Check whether the HVAC system recently cycled. A vent blowing cooled air can drop local temperature by several degrees, then recover within minutes.
- Note investigator body heat. Several people standing in a small room will raise ambient temperature. Leaving and returning will create apparent drops.
A genuine sustained temperature drop — reproducible, not explained by draughts, bridging, or HVAC — is worth documenting and submitting.
Understand what your device actually measures
Before concluding anything, be clear on what your device is designed to do. The panel below covers the most common devices used in investigations — honestly.
Common ordinary causes
| Reading | Most common causes |
|---|---|
| EMF spike | Phone transmitting, touching device casing, fuse box proximity, fridge motor |
| REM pod trigger | Person or animal moving nearby, breath, keys or metal object, another device |
| Cold spot | Draught, thermal bridging, HVAC cycle, window gap, investigator body heat |
| Spirit box "response" | Random radio fragment, audio pareidolia |
What the most common devices actually measure
K-II EMF meter
Detects AC electromagnetic fields in the range 50–20,000 Hz. It has no RF shielding, which means a mobile phone actively transmitting will trigger it from several metres away. It is not scientifically calibrated and cannot distinguish between a fridge motor, a power cable, and anything else producing a field in that range. Sustained readings in areas away from known electrical sources are worth noting. Single spikes almost always have an ordinary cause.
REM pod
Does not passively detect an external field. It generates its own small electromagnetic field and sounds an alarm when something disturbs it. Any conductive material, any person moving nearby, any warm moist air (including breath), or any other electronic device can trigger it. A trigger is not evidence of anything specific — it is evidence that the field was disturbed.
Spirit box
A spirit box rapidly scans AM and FM radio frequencies, producing short fragments of audio at speed. The human brain is extremely good at finding patterns and apparent words in fragmentary, distorted sound — a well-documented effect called audio pareidolia. PRN treats all spirit box output as unverified unless corroborated by independent documentation from the same session.
Standard thermometer / thermal camera
Both are legitimate scientific instruments, and genuine sustained temperature drops are worth documenting. However, thermal cameras are often misread — reflective surfaces, glass, and shiny paint all display falsely low temperatures due to low emissivity. Cold air pooling near the floor in an old building is normal convection, not anomalous.
When something might be worth a closer look
A reading is worth submitting when: it is reproducible in the same location across multiple attempts, no interference source can be identified after working through the steps above, it is sustained rather than a single spike, and it is consistent with independent documentation from the same location.
One unexplained spike is interesting. Multiple consistent, documented readings in the same location with interference eliminated is a case worth reviewing.