Collection of all the grades used in the petrol station EmuPSS is emulating. Id number for grades is automatically maintained in the order you enter them. Grades have the price too. Although you can use this form to update prices, the better way is to use POS clients for the task, because then the changes propagate to all connected clients.
Because the ID is ascending from zero, deleting the grade with an Id 3 will decrement Ids of Diesel and LPG grades by one, and any usage of those grades affected as fueling point grade options will be messed up. So, if you want to do that, please check the definition of the fuelling points after such an action.
