Is the geomantic compass sold by Taobao accurate?

It's a long story, including tens of thousands of azimuth meters with errors, which are only within the technical requirements. The compass is actually a compass, and it is impossible for ordinary people to test whether it is accurate. Generally speaking, people who have a compass foundation will not consider the text on the compass. In order to prevent others from piracy, the contents of the text on the compass have been deliberately mistaken, but less neglected.