end-checker
nounUK /ˈendˌtʃekə/
US /ˈendˌtʃekər/
A person or tool that checks the end of something.
The end-checker looked at the last page to make sure nothing was missing.
OTHER MEANINGS
2. A software routine that checks the ending of a file or data stream.
The end-checker flagged the file because it was cut off.
3. A device that marks or confirms the end of a line or roll.
The end-checker beeped when the paper roll ran out.
4. In games, a player who checks the final move or position.
As the end-checker, she confirmed the last move was legal.