IN-12 Nixie Tubes Clock in a Painted Plywood Case. Model Divergence Meter mini. IN-12 Nixie Tubes are one of the most beautiful, cheap and popular Nixie Tubes. PCB design, chematic, casing and software made by GRA & AFCH. Clock based on MCU (microcontroller unit) flashed with Arduino Uno Bootloader and sketch (Firmware). Clock compatible with Arduino Uno, so it allows you to write youre own unique programs on the Arduino platform. The latest sources are…