Insulation paper manufacturers and models is too much, we have no way to test all finished. Can only pick out a few to explain what we have to say. After all, the whole car stickers have tens of thousands of stickers, money should be spent, of course, to pick a good thing. In fact, we use these devices in the article, most of the paste insulation paper shops also have. Some will be measured to you, some will not. For the store, the sale of paragraph A and sell B for him anyway, there is profit, but because the information asymmetry, so that consumers in the purchase, there is not enough information to judge it.