µWatch: return of the scientific calculator watch

This month’s Retronics page takes an unusual slant by presenting µWatch, which beats all of the above hands down for DIY nerdiness.
The last scientific calculator watch was the Casio CFX-400 way back in 1985! It is so sought after today that even broken ones can fetch many hundreds of dollars. And a pristine one in working condition? — if you have to ask the price, you can't afford it.