The Sharp EL520XTBK performs over 419 advanced scientific functions and uses a two-line display with Multi-Line Playback, so a long expression can be stepped back through and one term corrected rather than the whole entry re-keyed. Direct Algebraic Logic keeps the on-screen equation in the same order as the textbook. Four modes — normal, statistics, complex and equation — cover the range from general maths through calculus, with a three-variable linear equation solver, one- and two-variable statistics, and built-in physical constants and metric conversions for lab work. Eight temporary and four formula memory buttons hold intermediate results. It suits students in algebra, geometry, trigonometry and calculus, and carries into statistics, biology, chemistry and physics. Twin powered; protective hard case included.

• 420 functions across 4 modes: normal, stat, complex and equation
• Large 12-digit, 2-line LCD with Direct Algebraic Logic (D.A.L.) and Multi-Line Playback
• 3-variable linear equation solver
• 1- and 2-variable statistics
• Built-in physical constants and metric conversions
• 8 temporary and 4 formula memory buttons
• Twin powered (solar with battery backup); protective hard case included