locktester
nounUK /ˈlɒkˌtɛstə/
US /ˈlɑːkˌtɛstər/
A person or tool that checks if a lock works.
The locksmith used a locktester to make sure the new door lock opened smoothly.
OTHER MEANINGS
2. A device used in manufacturing to test the strength and security of locks.
The factory's locktester flagged a batch of faulty padlocks before shipping.
3. Software that checks whether a file or resource is locked by another program.
The locktester reported that the database file was still in use.
4. A person whose job is to evaluate locking mechanisms for safety standards.
As a certified locktester, she inspects hundreds of locks each month.