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1, first check the manufacturer's inspection report if there is no *, if even the inspection report does not have a company, it is simply not legal, the quality of everyone can imagine.
2, you can choose the same metal sample to test it, the smaller the number of missed reports, the better. The test function of the metal signal is a representative of the strength of a manufacturer. A strong manufacturer can perform the same inspection on both non-ferrous metals and ferrous metals, and when the stability is very good, it can detect smaller metals. , can control the degree of flexibility well. 
However, when the security door with poor quality still increases the degree of flexibility slightly, it will alarm indiscriminately if there is no thing passing through it. If the flexibility is lowered slightly, it will take a lot of metal to pass through. Call the police. This kind of security door is because the design function of the circuit inside is poor and cannot be controlled because it cannot be used.
In addition, since the electromagnetic wave has a sense of direction, the detection of the metal object also has directionality, and the signal generated on the side that cuts the most electromagnetic wave is stronger, and on the contrary, it is weaker. So, using this method can also try it out.
How to identify the quality of security gates This is a topic of great concern to everyone. When purchasing security gates, we must pay attention to inspection reports and metal signal testing functions.