Alnico magnets produce magnetic field strength at their poles as high as 1500 gauss ( 0.15 tesla ) , or about 3000 times the strength of Earth 's magnetic field .
Alnico magnets produce very strong magnetic fields at their poles ( a pole is one of the two ends of a magnet ) as high as 1500 gauss ( 0.15 tesla which is about 3000 times stronger than earth 's magnetic field .