Eatonis Calculator:Vai is a scientific calculator with digits in Vai script, with additional functions for currency conversion and the calculation of taxes and gratuities. Its functions include:
Peek: Hold the peek button down to temporarily change the display from Vai digits to common Hindu-Arabic digits. The lock button locks the display to Hindu-Arabic digits.
Currency conversion: Converts the currently displayed number, interpreted as an amount in the first currency to the same amount in a second currency. If there is an active internet connection, then currency conversion rates will be updated once a day. You can get the reverse conversion by pressing the first to second mode switch and then the currency conversion button.
Tax: Computes a tax based on the currently displayed number.
Tip: Computes a gratuity based on the currently displayed number.
Memories: Use the store button to store the currently displayed number in memory and the recall button to recall a number from memory. Note that there are two memories, one in each of first and second modes.
Modes: Press the mode switch button to switch between first and second modes. Several of the other buttons change function when the mode changes. For instance, in second mode, the currency conversion reverses direction between the pair of selected currencies. There is one memory in first mode, and another memory in second mode.
Angle measurement: The radians/degrees switch determines whether angles are measured in degrees or radians when the trigonometric functions are used. The current scale is shown just above the keypad, to the left.
Hyperbolic/Circular switch: Press the hyperbolic geometry button to change hyperbolic trigonometic functions and the circular geometry button to change to circular trigonometric functions.
Arrow keys: Press left arrow to delete a digit, and down arrow to decrement the absolute value of the exponent in a number expressed in scientific notation.