# Chronometer

![](https://1781865142-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-LvaO9X8rr2FG8JwKkhC-1769347644%2Fuploads%2Fgit-blob-122afb71140f0ec8592af56761b9e8bca9daa31e%2FCaptura%20de%20Pantalla%202020-02-10%20a%20la\(s\)%2012.11.54.png?alt=media)

![](https://1781865142-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-LvaO9X8rr2FG8JwKkhC-1769347644%2Fuploads%2Fgit-blob-2f036926ec18145016cb4920407908cf55c55a53%2Fezgif.com-video-to-gif%20\(5\).gif?alt=media)

![](https://1781865142-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-LvaO9X8rr2FG8JwKkhC-1769347644%2Fuploads%2Fgit-blob-7c3b891977c4a7f7bdc70bc2e2dcfe4df20c9d9e%2Fezgif.com-video-to-gif%20\(6\).gif?alt=media)

### \*\*\*\*↗ **Callbacks**

* **Error at start / stop Chronometer:** you can set functions after there was an error when you start or stop the chronometer.
* **Chronometer started / stopped:** you can set functions after the moment you start or stop the chronometer.