checkingtool

2. A software feature that tests whether data or code is correct.

The app has a built-in checking tool that finds spelling mistakes.

3. A device used to measure or confirm a value, such as thickness or pressure.

The mechanic used a checking tool to measure the tire pressure.

4. A person or item used to confirm that a task was done properly.

The final checking tool in the factory makes sure every box is sealed.