The LG smartphone has an integrated stopwatch with the clock app, which allows you to measure the time and, if desired, laps, meaning you can save a split time.

Android 9 | LG UX 9.0
Stopwatch -  Open the  Clock -App
Stopwatch -  Tap on  Stopwatch
Stopwatch -  Tap on  Start
  1. Open the Clock-App
  2. Tap on Stopwatch
  3. Tap on Start