Can mahjong machine control the quality of directional cards?

You can't. According to the inquiry of Pacific Science and Technology Network, mahjong machine is a kind of automatic shuffler, which can't control the quality of directional cards. Mahjong machine is a machine that uses the magnetic principle to read the preset data information of each magnetic stripe in mahjong machine. Its working principle is that mahjong is placed on the magnetic stripe. Before mahjong machine does not work, the positive and negative poles of the magnetic stripe are attracted by the positive and negative poles of the permanent magnet and will not fall off.