Magnetic rods should be smooth surface resistance is small

Should do a good magnetic wand spatial distribution of magnetic flux lines, the maximum magnetic flux density point distribution as possible filled the entire root magnetic bar, because the general is on the movement of goods and transmission lines, the magnetic rods should be smooth surface resistance is small, does not contain environmentally harmful substances, avoid contaminated material and the environment. Surface magnetic induction intensity magnetic bar proportional to the size of the smallest particles can absorb, but in batteries, pharmaceuticals and other areas of fine iron impurities can cause a great impact, so the choice of more than 12,000 Gauss magnetic roller (∮110-∮220 ). Other areas you can use a little low.