NMR/MRI Fringe Field Detector Magnaprobe Mk I

SKU: 44701

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Map fringe fields & 3D ambient vector paths in NMR/MRI labs down to 0.3 Gauss. The analog Magnaprobe Mark I isolates low-level electromagnetic interference.

Map 3D Ambient Vector Fields/Track NMR/MRI Fringe Interference

The Magnaprobe Mark I is an ultra-sensitive, ambient magnetic field indicator that is ideal for mapping NMR/MRI fringe fields and identifying low-level stray magnetic paths. Electronic magnetometers require constant axis re-zeroing. The mechanical, analog 3D Magnaprobe Mark I "compass" responds instantly to environmental fluctuations as low as 0.3 Gauss (30 µT). This allows tracking a facility's magnetic baseline changes across open spaces, ensuring nearby sensitive instruments or low-field experiments remain isolated from ambient electromagnetic interference.

Details Specs Reviews
Details
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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 adjusted accordingly.
Environmental Mapping Feature Ultra-Sensitive Mark I (White) Standard Mark II (Black)
Primary Engineering Intent Fringe field mapping, ambient isolation & open-air vector tracking. High-field structural inspection & strong magnet polarity testing.
Minimum Field Sensitivity 0.3 Gauss (30 µT) ~3.0 Gauss (300 µT)
Open-Lab Fringe Mapping Excellent. Plots weak room-scale stray fields perfectly. Poor. Fails to register environmental fields under 3 Gauss.
Detection Range (12.5mm³ Magnet) Up to 300 mm away Up to 225 mm away
Geomagnetic Dip & Tilt Tracking Yes. Tracks Earth's vertical field angles. No. Insufficient ambient response.
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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