This is the SB116, an 8-bit programmer’s calculator powered by an Arduino Nano. It features a 128 x 64 pixel monochrome OLED display and can be powered by either a USB port or three AAA batteries.

But not so if you’ve got this beautiful custom RPN calculator in a wooden case. This one comes to us from [Shinsaku Hiura], who generally dazzles us with unique mechanical clocks and displays.