In the past few years, we have covered plenty of fancy Nixie clocks here. This IN-14 Single Digit Nixie Clock is ideal for those of you looking for something more simple. It uses a single digit to display the time. It also has a RGB backlight and acrylic enclosure.
This IN-14 Nixie clock has a DS3231 RTC with battery backup. It is powered by a 12V adapter.