Sharp EL520XTBK Advanced Scientific Calculator 420 Professional Functions with Direct Algebraic Logic and Twin Power

Large 12-digit, 2-line LCD display. Direct algebraic logic (DAL): 420 functions. 4 modes: normal, statistics, complex, and equation. 8 temporary memory keys and 4 formula memory keys. 3 linear equation solvers with variables. 1- and 2-variable statistics. Physical constants and metric conversions. Durable glossy black finish with white accents. Protective hard case. Dual power (solar with battery backup).