How to distinguish the magnet pole?

You can use another magnet (such as teaching magnet) that already marker with S and N pole, use N pole, slightly approach to the undefined magnet, if there comes attraction force, then it’s S pole(the other is N pole), if there comes rebell force, it’s N pole(the other is S pole), of course, it will be easier for you, before place the order, you can inform us this special requirement(we will maker a point on the North pole at each magnet).