Scientific Calculator with 417 Functions 2 Line Display & Solar Powered Exam Suitable for School/Study Black – OA-991ES Plus

Price: €22.99 - €16.99
(as of Nov 19, 2025 23:00:50 UTC – Details)

From the brand

DUPOTA brand history

Your partner with knowledge, your assistant in precision.

DUPOTA, a leading calculator brand, offers exceptional precision and innovative design to meet the diverse needs of our worldwide customers. Our products are designed for peak performance and provide a user-friendly experience that makes complex calculations easy and accessible. With DUPOTA, every calculation is a testament to our commitment to accuracy and intelligence.

552 function calculator

417 function calculator

Desktop Calculator

Desktop Calculator

Batteries ‏ : ‎ 1 LR44 batteries required. (included)
Product Dimensions ‏ : ‎ 18 x 8 x 0.1 cm; 125 g
Date First Available ‏ : ‎ 8 April 2024
Manufacturer ‏ : ‎ DUPOTA CO.,LTD.
ASIN ‏ : ‎ B0D14BH29M
Item model number ‏ : ‎ OA-991ES PLUS
Country of origin ‏ : ‎ China
Guaranteed software updates until ‏ : ‎ unknown
Best Sellers Rank: 16,067 in Stationery & Office Supplies (See Top 100 in Stationery & Office Supplies) 69 in Scientific Calculators
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417 functions scientific calculator: with 417 functions for fractions, including fractions, exponents, matrix calculations, statistics, integrals, algebra, calculations with complex numbers, standard deviation and more. OA-991ES Plus scientific calculator ideal for students, meets the requirements of most exams and needs in the field of mathematics.
Scientific calculator with natural display: the calculator supports the natural display of mathematical formulas and fractions, in two lines the calculation process and the results are displayed. Teachers can use the step-by-step display feature to demonstrate the derivation of complex formulas and help students understand complex formula calculations.
Efficient scientific calculator: A variety of function keys simplifies complex function calculations, button „S-D“ that switches between fractions and decimal numbers to process exact values in calculations. The included instructions will help you get started and use the calculator efficiently.
Dual power supply: the scientific calculator is equipped with a solar panel and a replaceable button cell battery to extend the battery life. It automatically shuts off after 8 minutes of non-use and supports contrast adjustment to get a comfortable display.
Ultralight and portable: calculator (approx. 125g); With clear button layout and an extendable hard case that effectively protects the screen and buttons of the calculator from scratches and damage, making it suitable for daily use and taking with you.