Quantity   Component name
1 × Arduino Pro Micro It's an arduino, but micro!
1 × DS18B20 1-Wire temp sensor Sensors / Temperature, Thermal-Wi
3 × IN-12A Nixie Tubes Nixie tubes, they're cool!
3 × K155ID1 Nixie Drivers BCD to Decimal decoder - eats HV for breakfast
1 × 4.7k Resistor Pull-up for use with the DS12B20
3 × 22k Resitors Current limiting resistors for the nixie tubes
1 × Laser cut acrylic box To finish things off and keep it all looking nice
1 × High Voltage Nixie power supply 9v --> 170v !!