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Multi-sensor instrument recording EMF temperature humidity and barometric pressure with graphing display
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Field reference
Potential Field-Use Benefits
A multi-sensor logger that records EMF, temperature, humidity, pressure and vibration together to an SD card, supporting after-the-fact analysis rather than relying on live impressions. Logged data should be reviewed against known environmental causes.
PRN has not tested or reviewed this product. This information is provided for reference only.
Technical
Specifications
Size
3.25 x 5.6 x 1.8 in
Battery
3 AA
Humidity
20-80 %RH, +/-3 %RH
Pressure
300-1000 hPa, +/-1.0 hPa
EMF Range
0-11 milligauss, single axis, down to 10 Hz
Vibration
3-axis accelerometer, +/-2G
Temperature
0-65 C, +/-1 C, 0.1 C resolution
Data Logging
all sensors to SD card, CSV
Understanding the tech
How it works
A data logger samples one or more sensors at regular intervals and stores each reading with a timestamp, so the session can be reviewed and graphed afterwards instead of relied on from memory. Typical channels include EMF, temperature, humidity, barometric pressure, vibration and ambient light; combination loggers (EDI+, Solus, Rook 2) bundle several and can plot them on a shared timeline.
The geophone / footstep tracker is different: it is a vibration sensor that detects ground or floor movement and lights up or logs when it senses a tap, footstep or structural vibration nearby.
The investigative point of logging is correlation: if several independent channels move at the same timestamp, that co-occurrence is more interesting than any single reading — though still not, by itself, evidence of a cause.
Use with care
Limitations
A logger inherits every limitation of the sensors feeding it. EMF channels still respond to wiring and devices; temperature still lags; geophones still respond to any vibration. Logging records the artefact faithfully alongside anything genuine.
Sampling interval matters. Brief events between samples can be missed, and a coarse interval can make a smooth change look like a step.
Time sync is essential. If a logger's clock and the camera/audio clocks disagree, correlation across devices breaks down.
Geophones are highly sensitive to ordinary vibration — footsteps elsewhere in the building, traffic, HVAC, slammed doors, the team's own movement.
A clean graph is not a clean cause. A spike is a spike; the logger cannot say what produced it.
Read the data critically
Common false positives
Mains wiring, appliances and team electronics on the EMF channel.
Draughts, HVAC and body heat on temperature/humidity channels.
Footfall, traffic, doors and structural settling on the geophone.
Clock drift between devices creating spurious or missed correlations.
Sampling artefacts — aliasing or stepped curves from too-slow logging.
Best practice: synchronise all device clocks at the start, baseline the room, log fixed EMF/vibration sources and where each sensor sits, and treat multi-channel co-occurrence as a prompt to investigate rather than a conclusion. Logging is a discipline tool — it makes claims checkable — not a paranormal sensor; nothing in this class is validated as detecting a paranormal cause.
PRN has not tested or reviewed this product. This guidance describes the device class and is provided for reference only.
Paranormal Response Network is not a seller, reseller, certifier, or safety authority for any equipment shown here. Listings may include vendor-submitted, sponsored, affiliate-linked, imported, or externally sourced information. Presence in this directory does not mean PRN has tested, endorsed, or approved any product or vendor.
