piezoelectric switches for use with scanners which enable an operator to feel like pushing a real switch by having an element built into the scanner vibrate when the scanner detects an object to be read, such as an image or barcode by a sensor; scanners; piezoelectric switches for use with scanners for use in the field of food hygiene which enable an operator to feel like pushing a real switch by having an element built into the scanner vibrate when the scanner detects an object to be read, s...