But the three-in-one compass belongs to the professional geomantic compass, which is often used by the three-in-one school. If you are Mr. Feng Shui, you must know that the position is very important when looking at Feng Shui. The compass degree in the mobile phone compass software is very different from the actual measurement, so it is often used to judge Feng Shui, and the consequences are very serious. If you want to use the compass software, you can only choose a professional electronic geomantic compass. At present, there is only one in the world, which is metaphysics.