Yes, SCANNER is a Scrabble word!

Letter values in Scrabble US: S 1, C 3, A 1, N 1, N 1, E 1, R 1.

Is it a valid word?

SCANNER is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

someone who scans verse to determine the number and prosodic value of the syllables
an electronic device that generates a digital representation of an image for data input to a computer
a radar dish that rotates or oscillates in order to scan a broad area
a radio receiver that moves automatically across some selected range of frequencies looking for some signal or condition

Also: digital scanner, image scanner, electronic scanner.