https://play.google.com/store/apps/details?id=com.ldroid.multistopwatchandtimer&rdid=com.ldroid.multistopwatchandtimer&pli=1
Multi Stopwatch & Timer - Apps on Google Play
Allows you to launch multiple stopwatches and timers at the same time !
multi stopwatchon googletimerappsplay
https://visualtimer.com/timers/multi-stopwatch/
Multi Stopwatch - Time Multiple Participants Simultaneously
Free multi stopwatch to time multiple participants at once. Independent start/stop for each timer. Perfect for coaches and races.
multi stopwatchtimemultipleparticipantssimultaneously