You probably already know this, but if you hit the cancel button only once, you can then zero without losing your count or settings. Pressing it twice wipes the count. Pressing zero without hitting cancel can cause it to auto-dispense with no pan under the nozzle. Don't ask me how I know.
One thing I don't like in the programming is there is no way to cancel the count of a load that went over and you "dump". would be nice to have an "undo" button that cancels the last drop counted.