This is an example of an early scientific calculator marketed by Texas Instruments. Building on the success of the SR-10, TI introduced it in 1973. The handheld electronic calculator has a black- and ivory-colored plastic case with an array of twenty-four small rectangular plastic keys.

The Texas Instruments SR-11 calculator was launched in the United States in September 1973 and was the first TI calculator with the new, smaller keyboard layout that is familiar from today's pocket calculators. The reason was that compared to its predecessor, the SR-10, the constant switch and the "PI" button were added.

The SR-10 and 11 are notorious; the silver trim is almost always worn on these models. An SR-10 in near mint condition would definitely qualify as "Difficult". The SR-50, 51, and 52 suffered from paint wear around the switches and later TI models …

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Texas Instruments SR-11 Slide Rule Calculator sn085270 September 1973 - $119.95 The SR-11 Slide Rule Calculator was basically an SR-10 that cost less to manufacture. No trig functions, so you would still have to carry a basic slide rule with you. Even then, the 12 digit red LED display allowed an almost 200 decade range in scientific notation.

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Lovely vintage TI SR-11 given to me as a birthday present from my parents many many years ago. In the original box with all parts and documents. I have attempted to charge it and haven't had luck. Sold as is.

The Texas Instruments SR-11 is an arithmetic calculator with 8 digits precision and algebraic logic. It has 10 functions, 24 keys, and an LED (light-emitting diode) display typical of calculators of this era.

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The Texas SR-11 calculator supports basic mathematical operations, including addition, subtraction, multiplication, and division, as well as square root and percent calculations. The Texas SR-11 calculator operates on a single battery, typically a 9-volt battery, which is inserted into the battery compartment located at the back of the device.