ELF gaussmeter (power-frequency magnetic field)

Detects

• Fields from house wiring, panels, transformers and overhead lines
• Net-current wiring faults, which show as whole-house elevation that does not fall off with distance
• Appliance fields at close range

Cannot detect

• Radiofrequency sources of any kind
• Intermediate-frequency fields from induction hobs and inverters if the meter stops at 2 kHz
• Static (DC) magnetic fields unless the meter explicitly supports DC

What to insist on

• Three-axis sensing, so the reading does not depend on how you hold it
• Milligauss resolution to 0.1 mG or better, since precautionary bands start at 0.2 mG
• Stated frequency response — a 50/60 Hz-only meter misses harmonics
• Data logging if you need a 24-hour average or a 95th percentile

Example models in this class

• TriField TF2
• Gigahertz Solutions ME3830B
• AlphaLab UHS2
• Extech 480826

About the model list

Named models illustrate the class and are not endorsements or verified specifications. Confirm the current frequency range and calibration statement with the manufacturer before purchase.

Related records

• ELF magnetic field survey

  A source-finding walkthrough plus a 24-hour log, because power-frequency magnetic fields track electrical load and a spot reading answers almost nothing.

  Measurement protocols

• Magnetic flux density

  The quantity an ELF gaussmeter reports, expressed in milligauss or microtesla, used to assess wiring, transformers and power lines. 1 µT = 10 mG.

  Quantities & units

Sources

1. sbm-2024 Building Biology Evaluation Guidelines for Sleeping Areas (SBM-2024) — Institut für Baubiologie + Nachhaltigkeit (IBN), 2024. ngo, link checked 2026-08-12.
2. niehs-emf Electric and Magnetic Fields — National Institute of Environmental Health Sciences. government, link checked 2026-08-12.