Prinztronic - SR99M


Brand: Prinztronic
Model: SR99M
Type: Calculator
Picture: Prinztronic SR99M
Batteries: AA x 2
Lifetime: Introduced: ca. 1972
Terminated: unknown
Notes: Letter by Wytse Hajonides The Prinztronic SR99M is a small and nice calculator from the nineteen-seventies. It has memory, a change-sign key, and the square root function. The "RM"-key pressed twice will clear the calculator's memory. When something non-zero is stored in the memory it is indicated by the leftmost decimal dot on the display.

Thanks to Wytse Hajonides for donating this calculator to my museum. He wrote me this letter (in Dutch):


A power adapter.

©2023 Ernst Mulder