This object shows the current level of the stapler's consumable (pins). Because the current stapler does not have the inteligent sensor, this object returns atLeastOne(-3) if the level is more than 50 pins, and returns unknown(-2) if the level is less than 50 pins. If kcprtStapler returns 'notPresent(5)', this object returns value (0) to show the stapler (and pin) is not be there.