Casio FX-991ES Plus Casio FX-991ES Plus scientific calculator is the most popular calculator in schools and universities features:Better understanding and overview through an enhanced displayr key arrangement and simple operationr supply:Solar power with backup battery menu functions.9 variables memorytion mode that making solving equations easierium Geometry setThis set contains everything you need for school lessons, packed in a precious metal boxentsCompass with pen.45 ° protractor.30 ° triangle.15 cm rulerersometer / protractorcilance meterpener.——Box contents:Casio FX-991ES Plus incltice manual (in German) and operating instructions (in English), Premium Geometry set.