Surface Gauss, Remanence and Flux
Three different measurements that buyers keep mixing up.
The original “surface magnetism, remanence and magnetic flux” article exists because incoming inspection arguments usually start with the wrong meter.
Surface gauss is a local reading on a face, sensitive to probe placement, coating thickness and the steel behind the magnet. It is useful for a quick check, not as the only acceptance number on a motor segment.
Remanence (Br) is a material property read from the demagnetization curve, not from a pocket gauss meter on a plated disc.
Flux is the integral of flux density through an area — what a Helmholtz coil or fluxmeter sees. Two magnets with the same surface gauss can have different flux if the area or the circuit changed.
When you send an RFQ, say which number your incoming inspection will use. We will quote the grade and the test that matches that number rather than promising a gauss figure that only exists on one point of one face.