Industrial metal detectors are used in the pharmaceutical, food, beverage, textile, plastics, chemicals, and packaging industries. Contamination of food by metal shards from broken processing machinery during manufacture is a major safety issue in the food industry. Metal detectors are not new to food processors. Metal contamination has always been a major problem. Sources include mechanic's tools and pieces broken off equipment, tags and staples carried into the plant with ingredients, and personal effects like jewelry and pens. Companies have installed systems in their plants for years to protect expensive production equipment from damage and to produce metal-free finished products .