The solar-powered Elektronika MK-60 was released in 1982 and manufactured at the Angstrem (Zelenograd, Russia), Billur (Azerbaijan) and Calculator (Ukraine) factories.
45 roubles bought you a simple arithmetic calculator with an eight-digit LCD display, set in a hardy metal case and — a first for Elektronika — able to harness the power of the sun.
The MK-60 was able to perform 11 operations automatically in under 0.6 seconds each.
"The calculator has a one-chip LSI circuit hosting 8,000 transistors and runs on both natural and artificial light (within 2 m of a 100 W bulb).
The automatic power-down that kicks in 10–12 minutes after the last operation is the hallmark of this model," declared the Central Research Institute in their Consumer Electronics News publication.
The MK-60 was followed by the functionally identical MK-60M and an export version — the ELORG-60.
Weight: 60 g or less
Dimensions: 115.2×65.2×9 mm