What are those small computers that read engine error codes called?

those small calculator like computers that hookup under the dash board and read out engine code errors that illuminate the check engine light

What are those small computers that read engine error codes called?norton 360

Scanners, or sometimes "scanning tool"

What are those small computers that read engine error codes called?photoshop

code scanners
Those are Diagnostic Scanners. They hook using either OBD I or OBD II ports.

OBD I - for vehicles before 1996

OBD II - for vehicles 1996 and newer
It is also called as the " CONSULT "