1991 -
Elektronika mk-93
The Elektronika MK-93 microcalculator was released in 1991 by Arzamas factory of radio components. There was also an export version with inscriptions in English. This model took the reins from the MK-53, also featuring a stopwatch, calendar, clock, and alarm.
The scale on the monitor: 1:1



The machine had the following modes:
— UT — time, stopwatch, calendar, and set alarm;
— T — stopwatch;
— MK — mathematical calculations.

Simple and accessible, the MK-93 could handle a total of eleven automatic operations including basic arithmetic, calculating square roots and percentages, and memory operations.

The device ran on two AA batteries.
Weight: 125 g or less
Dimensions: 140×98×23mm

Sources: user manual