Mark I Magnetic Shielding Leak Detector

SKU: 44701

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Test magnetic shielding validation and map micro-tesla flux leakage in mu-metal enclosures or accelerators. The 3-axis analog Magnaprobe Mark I detects down to 0.3 Gauss

Micro-Tesla Flux Leakage/Magnetic Shielding Effectiveness

The Magnaprobe Mark I is an ultra-high sensitivity, non-contact analog magnetic field indicator that can validate magnetic shielding effectiveness and identify microscopic flux leakage. This 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. 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 thresholds1.

1) Personal communication, Malcolm Cochrane, Cochranes of Oxford, 1995.

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Specifications
N42 grade neodymium magnets listed below are for reference only. Distance to detect very low magnetic flux leakage must be reduced accordingly.
Containment & Shielding Application Ultra-Sensitive Mark I (White) Standard Mark II (Black)
Primary Engineering Intent Boundary leak mapping & custom shielding factor validation. General polarity verification and high-field QA assembly.
Minimum Field Sensitivity 0.3 Gauss (30 µT) ~3.0 Gauss (300 µT)
Mu-Metal Seam Leak Tracing Excellent. Detects microscopic flux bleeding through joints. Poor. Insufficient sensitivity for weak leakage paths.
Detection Range (12.5mm³ Magnet) Up to 300 mm away Up to 225 mm away
Detection Range (2.5mm² Block) Up to 112.5 mm away Up to 50 mm away
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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