-Simple calculator. -Easy to use. -Higher flixibility with command promot. -Designed to be used by chemists graduate and undergraduate students. -Contain most functions used by chemists. -Contains most physical constants in use. -Allow to be used with only keyboard to increase flixibility, because flixibility and speed is very important, also can be used with mouse only. -All you need to do is to remember some commands and the calculator will be very easy to use with time. -You don't know how much it flixible. -In the first use you will use mouse keyboard much but with time you will remember some commands and you will only use command promot