Unitrex 95SL Handheld Electronic Calculator

This handheld electronic calculator has a tan plastic case and an array of twenty-four rectangular indented plastic keys. These include ten digit keys, a decimal point key (that can also serve as a memory exchange key), a percentage key, a total key, four arithmetic function keys (one of which can also serve as a squaring key and another as an inverse key), a square root key, four memory keys, a clear entry/clear key, and a function/clear function key.
Behind the keys is an eight-digit red LED display. A worn mark above it once read: UNITREX. The on/off key is on the right side and the power jack is on the left side.
A sticker on the inside of the battery compartment on the back reads: 9 VOLT BATTERY. The compartment cover is missing. Text at the bottom of the case reads: HONG KONG.
The model number is deduced by comparing this object to objects on websites and in printed sources.
Guy Ball and Bruce Flamm, The Complete Collector’s Guide to Pocket Calculators, Tustin, CA: Wilson/Barnett, 1997, p. 171.
[Advertisement], Progress Bulletin [Pomona, California], March 28, 1977, p. 26. Calculator selling for $7.99.
Vintagecalculators.com website.
Currently not on view
Object Name
electronic calculator
date made
ca 1977
Eiko Business Machine Company
Physical Description
plastic (case; keys material)
metal (circuitry material)
paper (sticker material)
overall: 7/8 in x 2 1/2 in x 5 1/8 in; 2.2225 cm x 6.35 cm x 13.0175 cm
place made
Zhonghua: Hong Kong
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
Credit Line
Gift of John B. Priser
Additional Media

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