Scientific Calculator E-3400 its a calculator with functions to find sin, cos, tan, cot, sec, csc, asin, acos, atan, Deg, rad, ln, logarithm x(y), π, e, e exponent, 10exponent, 1/x, X², X³, X⁴, Xⁿ, √, ∛, ∜, ⁿ√x, %, multiplication, ÷, +, −. It has the capability to save on Memory(M) the result of an operation and retrieve it with "back"M. User can clear the screen to “0” with key "C" and to delete one character at a time with the "delete" key Also, what makes Scientific E3400 great is the capability to convert values for Electrical, Energy, Frequency, Length/Speed, Power, Temperature, Voltage, Mass and more into targeted values. E.g. Enter number 30 on the value’s screen, press “℉-℃” key and obtain the equivalent of ℉ in ℃. Along with that, it is a great resource for students or any one who is curious to get more in deep; each group of Converters have an button that allows moving next screen and find all formulas for all conversions. Excellent tool in classrooms, job or any place/situation.