Weight detector can check packed products’ weight online whether their weights are overweight or less-weight to ensure the weight of products to meet standards. Check weigher is automatic device that used to check the products’ weight in automatic packing production lines, and it can check products in a continuous working process which weight accords with the standard weight we set or not. Also, the check weigher can automatically reject unqualified products. It is widely used in electronic hardware, pharmaceutical, food, chemical, beverage, health care products, and many other industries. For example, it can be used in food industry to check the weight of bread, cake, hams, instant noodles, frozen food, food additives, preservative etc, packaging products like bag, sachet, box, jar, cans, cartons, etc.