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Leo Braille Display Calculator
Calculator
Contact us to order
The
Leo Calculator is named after the famous mathematician Leonard Euler
(1707-1783), who gave us the basis of natural logarithms, the famous
Euler's number.
When losing sight of his right eye, this
remarkable mathematician said, "Now I will have less
distraction...". Shortly after that, the sight in his other eye began
to deteriorate. Euler had always had an outstanding memory and could do
enormous calculations in his head, so he prepared for the coming blindness
by learning to write formulas on a slate and to dictate mathematics to his
secretary.
He was blind for the last 17 years of his
life and, during that time, his mathematical productivity actually
increased. He remains the most prolific mathematician of all time, having
written 886 books and papers.
The Leo Calculator is designed for the widest
possible user base: students who will take advantages of the calculator's
scientific functions, professional people who need financial functions and
conversions, as well as people who need an affordable Braille calculator
for everyday use.
The Leo Calculator is elegant and small in
size. It measures 9 by 12 by 2.4 centimeters (4.75 by 3.75 by 0.8 inches)
and weighs approximately 250 grams (10 ounces), including batteries. The
Nickel-Metal Hydride batteries are fully rechargeable and a suitable mains
charger is supplied.
In addition to the standard arithmetic
functions, the Leo calculator also features numerous scientific functions
including square root, sine, cosine, tangent, logarithm and their
corresponding inverse functions; conversions, financial functions and
others.
Tech notes: Functions: Four basic
arithmetic functions (plus, minus, times, divide), sin, cos, tan, arcsin,
arccos, arctan, ln, log, exp, square root, power-to-n, nested parentheses,
memory, financial and conversion functions. Accuracy: 10 significant digits
plus one hidden for rounding. Display: tactile 8-dot, 8 cells, Robotron
mechanotronic type. Dimensions: 120 x 90 x 24 mm (4.75 x 3.75 x 0.8 in).
Weight: 250 grams (10 ounces).
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DDS Enterprise
Headquarters: P.O. Box 519
Ft. Lauderdale, FL 33302
1-800-981-5119
Fax: (954) 462-4647
sales@dds-enterprise.com
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