How to choose a cost-effective skin testing instrument?

I believe that many friends who open a store will use skin detectors. Facing the variety of detection instruments on the market, how to choose a suitable and cost-effective detector? ? The most important thing to pay attention to when choosing a skin testing instrument is two points:

First, look at the hardware, mainly from the two dimensions of light source and imaging. We all know that skin detectors use the principle of spectral imaging to take pictures of our skin conditions to capture problems, so the layout of the spectrum is very important. Generally, companies that make detectors will cooperate with some professional authoritative organizations for research and development. , it is better to use light film imported from Japan; in terms of imaging, in addition to the layout of the light source, it also depends on how many original images the detector can take. Currently, the most advanced instrument on the market is the five-spectrum instrument. Don’t be fooled by the images of the merchants. The analysis pictures are fooled. Different spectrum analysis has different dimensions of skin problems, but at most there are only five spectra, there is no six or eight spectra. If you really can't tell which image is clearer, the quickest way is to try to take pictures of different brands of instruments under the same spectrum for comparison, of course, the premise is that the shooting environment must be consistent.