Simple way to time my laps by myself?

[racerpt]

Hi, recently started karting more regularly just for fun. Can someone give me some tip on a simple way to time myself ?

I have a good track very close and i can go there practice on the rentals with some races with friends once in a while.

I'm imaging a digital chrono i can clamp on the steering wheel (something that can just clamp, it' s a rental!). I just need something that can time each lap, i press a button when i cross the line, it shows the time freezed briefly and meanwhile is already timing the next lap and so on.

Any tips?