HP15C Scientific Calculator

Description

This is an iconic gadget from the 80's. It was released in 1981 and discontinued in 1989, as part of "10C series", which included the 12C, still on sale. I bought mine in 1987, when in college, and I am still using it. I also have the 15C app on my iphone. There was a special and limited edition released in 2011, with 1,000 units only. References: (http://en.wikipedia.org/wiki/HP-10C_series), (http://www.hpmuseum.org/hp15.htm).