Quantity   Component name
1 × cheapest chinese caliper "carbon fiber" black plastic 100mm type
1 × Arduino Nano CH340G, Atmega 328
2 × LED red 1,5V voltage drop
3 × resistors 200ohm, 500ohm, 2k
2 × capacitors 4,7uF, 47uF
2 × pin header 5pin in a row