Compex ST-10 Handheld Electronic Calculator

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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
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
Credit Line
Gift of John B. Priser
See more items in
Medicine and Science: Computers
Handheld Electronic Calculators
Computers & Business Machines
Data Source
National Museum of American History


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