Yu Pei can be identified in ordinary jade shops, which are equipped with special instruments for testing. You can go directly to the store for consultation, but if the store doesn't sell Yu Pei, there will be some fees for the appraisal, and only the store's own Yu Pei will conduct the appraisal for free.
Real jade is warm and shiny, translucent and opaque, and it is normal for jade to contain cotton wool or other impurities. Fake jade has no aura, its color is dry and dull, and some have bubbles in it. You can try to drop a drop of water on the jade. If it does not disperse in the shape of dew for a long time, it is real jade, and the water droplets will disappear soon, which is a fake and inferior product.