Whether in the office at the desk, for commercial calculations in the business or at home for private accounting � a pocket and desk calculator is an indispensable companion. The advantages of the Casio DF-120EM include: currency conversion (1 rate): after entering and saving the desired exchange rate, amounts can be easily converted into another currency. Professional Percentage Calculation: Determine percentage increase and decrease with separate display of calculated value. Mark Up with percentage button: quickly determines margins and beats in the commercial sector. Cost / Sell / Margin: The profit calculation allows you to calculate costs, sales price and margin. Quick correction button: delete current entries in numerals for quick correction without deleting the entire calculation. +/- sign change: e.g. from 100 to -100 or vice versa, at the touch of a button. Round adjustment: individual definition of rules for rounding. Total total memory (GT): It is used to automatically save all the sum of a computing process. 3 key memory: memory keys can be saved for later use. Thousands of division: after three digits, the thousand separation is visually represented by a marking. Solar / Battery Operated - The devices are solar powered and supported by battery operation if required. If the calculator is not used for 6 minutes, it turns off automatically. This also protects the battery. Memory protection battery: stored data such as currency rates or tax rates, will not be lost when you change battery or power off Rubber feet: on the back of the device.