6 Pack Small Digital Kitchen Timer Magnetic Back and ON/Off Switch,Minute Second Count Up Countdown (Multicolored)
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ISL on hackernews2w
Yep. Any timer will do.
If you find yourself programming an eInk display and a microchip in order to improve your procrastination, it is time to stop working on the project, get a physical timer, and work on the thing.
If you feel inclined to shop around for a timer before getting to work, I'll save you the search. These work great. https://www.amazon.com/dp/B07TLC9SFZ (but any timer will do).
Go do the thing. You're worth it.