How to accurately measure the orientation of the house? Is it indoor or outdoor?

Is it indoor or outdoor? Of course, both views are for accuracy. The measurement outside the house and ten meters away is very accurate, which avoids the influence of steel bars on the magnetic needle. Secondly, indoor measurement, indoor is your own magnetic field. This is obviously mentioned by two people in their works. One is Lin Guoxiong, and the other is Chen Xuetao. They think that the magnetic field that has been formed indoors is your own sitting direction. In modern architecture, there are great differences, but if you are indoors, different places will have different results. I've tried this many times myself, unless I average it and measure it more than a dozen times to see which mountain has more times. As for the degree, it is impossible to get an accurate result. I have measured it in many places indoors, and I have had several results, such as Renshan C, Haishan IV, Renshan Concurrence, Haishan Concurrence, Meridian and so on. Of course, it still takes the same time as the results outside the building, that is, Renshan C. It can be seen that the practice of indoor testing is risky, especially on TV and computers, and the pointer is very different. Therefore, the statement of indoor measurement is doubtful. It is possible that the geomantic omen can still be broken and the work can be done correctly, which is also caused by the uncertainty of metaphysics.