1. In a dark environment, there is a faint "back" on the back of the genuine product, which can only be seen by turning on the first or second gear of the machine, while the fake product is invisible.

2. The plastic area of the guide head of fake goods is whiter, slightly yellow and more transparent than the genuine goods.

3. The real thread is flat, the fake thread is a little rough and thick.

4. Reflecting the control mask, it can be found that the fake panel is uneven, and it is easy to see that it is rough.

The real instructions are yellow and beautifully printed. But the fakes are white and the printing is rough.