ухилен оценка не правете nano second timer Земя първи стан
tonguk 1/100 Second Nanosecond Sports Stopwatch with Metal Plating Full Surface 2 RPM Chronograph Memory Currency LCD Digital Stopwatch with Lanyard : Amazon.co.uk: Sports & Outdoors
6.25 Nanosecond Resolution Timer for Any Microcontroller! - Instructables
Arduino countdown timer with two displays and a buzzer, part 1: Display Terminal – thesolaruniverse