scanner

noun

1. One who scans.

   “It is, perhaps, too much to assume that an elderly Melville read James, but he was an eager scanner of magazines and did read fiction in his later years.”

2. A device which scans documents in order to convert them to a digital medium.

   “He put the picture in the scanner, then e-mailed a copy of it to his family.”

3. 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.
4. A radio receiver which iterates through a sequence of frequencies to detect signal.
5. A device which uses radiation (ultrasound, X-ray, etc.) to generate images of tissue or surfaces for diagnostic purposes.

   “Chorban: I'm using a small scanner to gather readings on the keepers. Chorban: So far, I've had mixed results. I find it difficult to get near the creatures.”

6. A device which uses optics to detect printed data (such as a barcode).