Combo metal detector and check weigher can be widely used in food, plastic, chemical, textile, garment, toy, paper-making, hygienic products, electronics, renewable resources industry etc, applying to detect broken needles, iron wires, metals (such as Ferrous; Copper; Brass; Aluminum; Stainless steel etc.) that mixed with products, raw materials. Check weigher machine can check the non-packaged products and can check the packaged products weight online whether their weights are overweight or under-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.