Elektronika B3-36

Elektronika B3-36 (Russian: Электроника Б3-36), renamed to Elektronika MK-36 later in the production, is a soviet calculator. It was produced since 1979. It is able to perform four arithmetic operations: calculating natural and decimal logarithms, antilogarithms, direct and inverse trigonometric functions, reciprocals, factorial, perform calculations with two-level brackets, exponentiation, extraction of roots, do basic operations with its memory. Very few changes were made when it was renamed to "Elektronika MK-36" in 1986.[1][2]

MK-36

It was designed for scientific calculations and engineering. Elektronika MK-36 is able to operate on either three Д-0,25 soviet batteries or when connected to the power grid.[3]