Magnetic Force Detector

SKU: 44701

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The Magnaprobe Mark I is an ultra-high sensitivity, non-contact analog magnetic field indicator designed for validating magnetic shielding effectiveness and identifying microscopic flux leakage. This passive 3-axis mechanical sensor responds instantly to localized fields as low as 0.3 Gauss (30 µT). This level of sensitivity makes it an ideal diagnostic tool for testing custom mu-metal enclosures, iron shielding joints, and scanning physical containment boundaries for stray fields. In fact, high-energy physics institutions like CERN have utilized the Mark I precisely because no other handheld device provides instantaneous, mechanical 3D vector alignment at sub-Gauss thresholds.

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Details
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Specifications
Specification Technical Details
Sensor Core Precision-balanced AlNiCo bar magnet (20 mm length) featuring distinct, colour-coded North/South poles.
Suspension Mechanism Ultra-sensitive gimbal mounting resting on low-friction, precision jewelled bearings to eliminate rotational resistance.
Form Factor Dimensions Compact, lightweight analogue probe layout with a total structural tool length of 122 mm.
Magnetic Sensitivity Range Responds to fields as low as 0.3 Gauss on its primary axis and 0.7 Gauss across secondary axes, sensitive enough to register Earth's weak geomagnetic field lines.
Power Requirement 100% passive mechanical operation. Requires zero batteries, external wiring, software calibration, or maintenance.
Advanced Diagnostics & Applications
  • Magnetic Shielding Verification: Designing, profiling, and testing the integrity/effectiveness of magnetic shielding materials against DC electromagnetic interference.
  • Industrial Leak Detection: Locating hard-to-find residual magnetic field radiation, stray flux leaks, and hardware hotspot anomalies.
  • Laboratory Environment Auditing: Mapping and confirming field containment integrity for high-sensitivity imaging rooms (such as MEG/SQUID rooms or NMR fringe field zones).
  • Academic Instruction: Replicating 3D dip circle fields, tracing 3-axis vector lines around coils/wires, and simulating avian quantum biological navigation paths.
Reviews (1)
2018-01-30

I have bought several of these over the years, originally from the British company that makes them, and more recently from this company. I have trouble keeping them because everyone seems to want one. They are indispensable for showing the angle of the magnetic field in three dimensions. It is like a 3 dimensional compass, and very sensitive too. It will even show the vertical angle of the Earth's magnetic field! If your business is magnets, you need one of these.

— Mark
— Indigo:

Thanks for the feedback. This version, the Mark I is incredibly sensitive as you noted. We had them tested once & the will respond to a field as weak as 0.3 gauss. Besides declination they are great for detecting magnetic leakage in NMR/MRI labs. Overkill for Q/A though, use the Mark II instead.

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