There are many (mostly physical) predefined constants, which can be put on any of the six buttons C1 - C6 by selecting the desired constant in the popup menu that appears after right clicking on one of the constant buttons and selecting Choose from List. Though the predefined constants can also be accessed via the Constants in the menu bar, storing it on a constants button is very handy, if the number is used frequently.
Existen varias constantes (a maioría delas son físicas) que se poden colocar en calquera dos seis botóns C1 - C6, se se selecciona a constante desexada no menú de contexto que aparece ao premer un dos botóns de constantes e seleccionar a opción Escoller da lista. Ainda que tamén se poida acceder ás constantes predefinidas a través do menú Constantes, pode ser útil gardalas nun botón de constantes se o número for usado con frecuencia.