Compex ST-10 Handheld Electronic Calculator

This unusually thin handheld electronic calculator has an aluminum case. The array of twenty-two gray and white rounded plastic rectangular buttons includes ten digit keys, a decimal point key, a total key, four keys for arithmetic functions, a percentage key, a square root key, three memory keys, and a clear key. The on/off switch is between the keyboard and the eight-digit green fluorescent display. A mark below the display reads: CE COMPEX (/) ST-10. A mark below the keys reads: SUPER THIN (/) ELECTRONIC CALCULATOR. The text printed on the back is largely worn away. The outlet for a recharger is at the bottom right.

Unscrewing a screw in the back makes it possible to change two large squat batteries. (This example has no batteries and no recharger.) A component taped to the back of one circuit board is marked in part: DELTA (/) DC. A mark on the display reads: itron FG94B1 (/) JAPAN JC.

A May 26, 1977 advertisement in the Los Angeles Times indicates that the Compex ST-10 sold for $14.97. This included both a wallet carrying case and the battery recharger.

According to the Datamath Calculator Museum website, Compex calculators were a product of Kinpo Electronics, Incorporated, a firm established in Taiwan by 1973.

References:

Datamath Calculator Museum, http://www.datamath.org/.

Los Angeles Times, May 26, 1977, p. A14.

Currently not on view