As seen on Engadget the Nixie Clock and Nixie Wristwatch are:
NixiChron remains accurate to within a fraction of a second of the GPS Satellite transmission. Far superior to local oscillator and AC line referenced clocks. Local Time, Date, Latitude / Longitude coordinates, and the temperature can be configured to scroll across the display at intervals of: 1, 15, 30, 60 minutes. Time can be displayed in 12 or 24 hour format. For 12 hour format: a PM indicator is located at the lower left of the display. Date can be displayed in either mm,dd,yy OR dd,mm,yy format. The temperature can be displayed in degrees F or degrees C with quarter degree precision. A pleasing soft chime tone can be enabled to strike at selected intervals, and a choice of chime styles are provided. The scrolling speed can be varied from slow to -fast in a range of ten individual steps. And, each of the features can be separately disabled from the periodic scrolling cycle. The colon indicators separating the paired digits can vary their configuration to upper, lower, or independent. This determines whether the Time, Date, Coordinates or Temperature are currently being displayed.
Oh, I know I shouldn't buy one, but I really really REALLY want one. I've always had a fascination with chronometers (watches and clocks to you normal people) and these look like they should be found in a Steampunk novel.