One or several first made according to the product appearance drawing or structural drawing, used to check the appearance or structure of the functional model. Shenzhen Shouban proofing is currently also called the first board in different places. The new product proofing has the following benefits.

　　 The first is to verify the appearance, just look at the picture. If there is no physical object, the product cannot be verified intuitively, and the customer does not accept it. The customer needs to be able to hold the actual product.

　　 The second is to verify the function. According to the functional test cases, test one by one to check whether the product meets the function required by the user.

　　 The third is to participate in the exhibition, when there is no product, you can use the hand board instead of the product to be displayed at the exhibition, do a good job in the publicity work, and even get orders.

　　 The fourth is direct sales, such as structural prototypes, also called functional prototypes, which can be directly sold as products on the market. Also, after trial production of prototypes in small batches, they can be sold directly to verify the market‘s response to the product.

The fifth is to reduce the cost. After the product is designed, it is generally not perfect or even usable. If it is directly produced, it will be scrapped once there are defects, which greatly wastes manpower and material resources and time, and the loss is much larger than the cost of prototype proofing. Many, because the prototype is generally a small number of samples, the production cycle is short, the loss of manpower and material resources is small, and the shortcomings of product design are quickly found to improve and provide sufficient basis for product stereotypes and mass production.