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.
Datamath Calculator Museum,
Los Angeles Times, May 26, 1977, p. A14.
Currently not on view
Object Name
electronic calculator
date made
ca 1977
Physical Description
metal (case; circuitry material)
plastic (keys; display screen material)
glass (display backing material)
overall: 1/2 in x 2 3/4 in x 4 3/4 in; 1.27 cm x 6.985 cm x 12.065 cm
ID Number
catalog number
accession number
See more items in
Medicine and Science: Computers
Handheld Electronic Calculators
Computers & Business Machines
Data Source
National Museum of American History, Kenneth E. Behring Center


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