How to choose feng shui compass? Can you provide pictures?

How many points does a compass have: 1, and the center Tianchi should be accurate; 2, the external disk to the party; 3, the four sides should be flat and cannot be bent; 4, the compass should be flat and cannot be changed; 6. The gap between the inner disk and the outer disk should be flexible; 7. The font of the disk should be clear; 8, the contents of the disk should not be loose; 9, the size should be suitable for 10, and the meridian red line is important. I saw this in a Taobao shop called Jiyitang. . The compass in this house is really good. . Because I'm not good enough, otherwise I can send you some compasses I just bought for your reference. . You can visit this Taobao shop. . Search Tang Yi Feng Shui Compass and you should find it ~