Searching for an alternative to a chess clock.

Hi everyone! I am a teenager and I was setting a chess tournament at my school, soon I realize that I would need a chess clock/fischer clock and I've been looking for options in the internet(because nearby me there isnt any place where I could buy a chess clock) and I notice by their reviews that they are incredible expensive and fragile, plus the shipping, this is not going to end near the price that I was willing to pay(Ineeed more than one clock). so I was wondering if there is a program, web o something that I could use to replace the clock, something with a double-chronometer that with only one click could stop one and restart the other one, something that could do the job. If there is any mistake in my writing, sorry, english is not my first language

Please help, I think iam 💀🪦🪦🪦

Digital clock aren't really fragile. There are several clock apps you can simply use on your phone.

What is your budget and how many clocks will you need?

28€ in Belgium. it's not that mutch!

Will the free Chess.com chess clock App work? 

I like using the chess clock program integrated into the lichess app as it has more time control options than the chess.com clock app (most notably increment with handicap and the funky 'hourglass')

Yep. Those apps work for me. Thankyou guys