Technical Foundation
What Is a Magnetic Field Measuring?
Gaussmeters and teslameters measure magnetic flux density using a Hall-effect sensor mounted in a probe tip, which outputs a voltage proportional to the field strength perpendicular to the sensor. Gauss and tesla are both units of flux density (1 tesla = 10,000 gauss); instruments are typically labeled by whichever unit their target market uses, with gaussmeters common for lower-field work like permanent magnet testing and teslameters common for higher-field lab and MRI-adjacent applications.
Probe geometry matters as much as range: a transverse probe senses field perpendicular to the probe's flat face and suits measuring between magnet poles or in a gap, while an axial probe senses field along the probe's own axis and suits measuring at the end of a magnet or inside a bore. Probes are also specified for AC, DC, or both — a DC-only probe cannot characterize an alternating field, and vice versa — and probe tip thickness determines the minimum gap the probe can physically access.
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| Spec | What It Means | Why It Matters |
|---|---|---|
| Field Range | Instrument- and probe-dependent, from micro-gauss to several tesla | Must exceed the expected field strength with margin, and resolve the expected minimum reading |
| Probe Geometry | Transverse (perpendicular) vs. axial (in-line) | Determines whether the probe can physically access the gap or bore being measured |
| AC/DC Capability | DC-only, AC-only, or combined AC/DC probes | A DC probe cannot characterize a time-varying field and vice versa |
| Probe Tip Thickness | Varies by probe design, thinner tips access narrower gaps | Sets the minimum air gap the probe can be inserted into for measurement |
| Accuracy & Resolution | Stated as % of reading and digit resolution, instrument-specific | Determines suitability for QA/calibration work vs. general field surveys |
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Applications
Where Magnetic Field Measuring Get Used
Magnetic field instruments are specified anywhere a magnet's field strength, orientation or uniformity needs to be verified against a known spec.
Permanent Magnet Manufacturing QA
Handheld gaussmeters verify magnet strength and pole orientation against spec during production.
Motor & Generator Manufacturing
Field measurement verifies rotor and stator magnetic assemblies meet design field strength before final assembly.
MRI & Medical Equipment Service
Teslameters characterize and verify magnetic field strength and homogeneity in medical imaging equipment.
Research & Physics Laboratories
Bench teslameters and Hall probes characterize electromagnet and permanent magnet fields in experimental setups.
Electromagnetic Compatibility Testing
Fluxgate magnetometers measure low-level ambient and stray magnetic fields for EMC and shielding verification.
FAQ
Magnetic Field Measuring Questions, Answered
What's the difference between gauss and tesla?
Both measure magnetic flux density; tesla is the SI unit and gauss is the CGS unit, related by 1 tesla = 10,000 gauss. Manufacturers label instruments by whichever unit is conventional for their target application — gaussmeters for lower-field work, teslameters for higher-field lab and industrial use — but many instruments display both units.
Should I choose a transverse or axial Hall probe?
A transverse probe senses field perpendicular to its flat face and is the standard choice for measuring between magnet poles or in an air gap. An axial probe senses field along its own length and is used when the measurement point is at the end of a magnet or inside a bore where a transverse probe's flat face can't be positioned correctly.
Can I use a DC gaussmeter to measure an AC magnetic field?
No — a DC-only probe and meter combination is designed to read static fields and will not accurately characterize a time-varying AC field. Confirm the instrument and probe are rated for AC measurement, or for combined AC/DC use, before measuring an alternating field.
How thin does a Hall probe tip need to be for gap measurements?
It depends on the physical gap being measured — probe tip thickness varies by model, and the probe must be thin enough to insert into the gap without being compressed or damaged by the magnet poles. Check the probe's stated tip thickness against the actual gap dimension before ordering.
How often should a gaussmeter be calibrated?
Follow the manufacturer's recommended interval, typically annually, and use a calibrated reference magnet or manufacturer calibration service to verify accuracy — this is especially important in QA and metrology applications where measurement traceability is required.
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