Quantity   Component name
1 × Sinclair Scientific Calculator PCB https://oshpark.com/profiles/ArduinoEnigma
1 × Arduino Nano
3 × 3 digit LED Display (2352B) Ultra bright COMMON ANODE 0.25" RED 7 Segment display 3 Bit Digital Tube 0.25 inch LED https://www.aliexpress.com/item/32803893497.html
1 × Power Switch 2 Position On/Off SPDT 3 Terminal PCB Panel Mini Vertical Slide Switch
10 × 6mm x 6mm x 5mm Blue Momentary Tactile Pushbuttons For the digits 0..9
8 × 6mm x 6mm x 5mm White Momentary Tactile Pushbuttons For the function keys
8 × 1K resistor Current Limiting Resistor for the LED display
3 × 4.7K resistor Current Limiting Resistor for the keyboard selection lines
4 × M2x6mm Plastic Screw
4 × M2x15mm Plastic Female Hex Standoffs