You can find that the compass software downloaded directly from the mobile phone and ipad is not accurate and can't be used to see Feng Shui at all. Degree deviation will only have serious consequences for Feng Shui judgment. Metaphysics is a professional geomantic compass, including magnetic field correction, demagnetization, laser lamp positioning, GPS ranging and so on, which can not be solved by a mobile phone software.
In addition, there are many imitations of Apple mobile phones. Many people who engage in geomantic omen are elderly people, and their ability to distinguish between true and false is not high. Unscrupulous merchants can easily use fake Apple phones and some cottage tablets to install electronic compass software for sale. Really not suitable for selling as a compass!