This handheld electronic calculator is designed to fit into a checkbook (this example has no wallet). It has a plastic front, circuit board, and keys. The twenty-three rectangular keys include ten digit keys, a decimal point key (that can also serve as a memory exchange key), a percentage key (that can serve as a square root key), a total key, four arithmetic function keys (one of which can also serve as a squaring key and another as an inverse key), four memory keys, a clear entry/clear key, and a function/clear function key. The on/off switch is left of the three keys in the top row. There is space for six AAA batteries but no battery jack.
A sticker on the back of the calculator circuit board reads in part: UNITREX MODEL CB-8SL ELECTRONIC CALCULATOR. It also reads in part: SERIAL NO. 94456 (/) HONG KONG
Compare Unitrex CB-8SL (1986.098.161) and Novus Attache (1986.0988.227).
[Advertisement], Eastern Progress, April 28, 1977, p. 8. Unitrex CB-8SL on sale for $17.99, regularly $19.99.
[Advertisement], Sedalia Democrat [Sedalia, Missouri], October 26, 1977, p. 36. Unitrex slide rule checkbook calculator selling for $9.99.
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