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For a portable calculator that doesn't feel flimsy, choose the Casio EL240SAB. Finished in a silver with a smart colour-coded keypad and a large 8-digit tilted display, it is a stylish and functional handheld machine. Using a twin power source to help save energy and a protective cover that protects it from knocks and nudges in your bag, this is a great calculator to slip in your pocket for when you need to work something out on the go.