I according to the information query, and combined with the technology of the Guangzhou crystal stone sensing to give you a great reference value of the views of the main articles:
1, look at the sensor appearance and production process, to the manufacturer to see the sensor production equipment (do not be superstitious manufacturers of plant size, the cost of plant in different areas of the difference is great), mainly the production equipment;
2, signal detection test, especially the end of the signal and the middle part of the signal is consistent, whether it is guaranteed;
3, to understand whether the sensor needs to be installed auxiliary sensors (such as trajectory sensors, anti-cheating sensors,), a really good treatment of the super-quartz sensors (especially crystal stone sensing) only need to be seamlessly installed can be, does not require any auxiliary sensors, auxiliary sensors, auxiliary sensors can only mean that you buy a poor quality sensor. Sensors can only show that you bought a poor quality sensor also let you believe is high-tech, huh! Not much to say, you know!
4, do not be superstitious some manufacturers to provide you with certificates, unless you have a strong professional ability to identify!