scanner

One who scans.
A device which scans documents in order to convert them to a digital medium.
A device which scans barcodes or QR codes for the purpose of charging a customer, performing a price check or enquiry, printing a price label or sticker, checking an item in or out of the store or warehouse, or finding an item ordered through click and collect and its corresponding location; a pricing gun or HHT.
A radio receiver which iterates through a sequence of frequencies to detect signal.
A device which uses radiation (ultrasound, X-ray, etc.) to generate images of tissue or surfaces for diagnostic purposes.
A device which uses optics to detect printed data (such as a barcode).