Quantity   Component name
1 × Project Box In my case, a microscope slide box was perfect.
1 × Arduino Nano
1 × piezoelectric buzzer for audio indication. get creative and make it play a tune when it is done testing..
2 × alligator clips just what i used
2 × magnets 52N rare earth, 1cm diameter.
4 × stand offs
2 × switch NO push button
1 × Transistor MJE3055T
1 × Load Resistor 5 Ohm, 5watt
1 × 470 ohm resistor
4 × 10k resistor for voltage dividers
2 × 3.3k resistor for pullups
1 × OLED 128x32 or 128x64 ssd1306 OLED display