Get your sums right every time with our Scientific Calculator. Being dual power with a replaceable battery to the calculator, you can be assured you'll never run out of power when you least expect it again. With 240 functions, including a function to work out the square root, this calculator is perfect for helping you through maths exams or getting your figures straight at work. With an acrylic cover and plastic keys, it's also very durable. Batteries required: 2 x LR44/AG13 (included).