Sharp EL-W506T vs. Sharp EL-W516T

[rprosperi]

All the Sharp EL-Wnnn... utilize the "WriteView" feature, which is marketing speak for displaying algebraic equations in 'graphical' form (meaning fraction, integral and root symbols, etc. not true graphics). Models that don't have the 'W' prefix in the model don't have that capability. Most often (but not 100% of the time) the trailing letters are for colors, cover stle, and other pkg. type tweaks.