How big is the Feng Shui compass?

There are not many compasses for 28 nights, both of which are large. But does it take two twenty-eight nights to stand upright?

There seems to be one in Rixingtang, and then there is a one-foot color comprehensive disc in Jiyitang, which has a pair of 28 nights. The words are bigger and look better. I also want to buy a compass recently, but I am a beginner and just want to buy a medium-sized comprehensive disk. Generally, there are 28 nights on the compass, and the other one doesn't know how to use it yet. I have been paying attention to the compass of Jiyitang recently, which is very good. Do you have any opinions? Ha ha.