I suppose some chemicals need more accurate application. The ones I use have a range for the type of crop. Wouldn't like to apply more of less than amount needed so I'm 'self calibrating'. It's in my interest. I can overspray with a calibrated sprayer just as easily as I can with non calibrated one. I can under spray, over spray, double spray with either but I wouldn't want to do that. I would change a nozzle that was causing t he wrong fan pattern, that's just common sense.
Nah, don't need a calibration certificate! (Run, duck and hide!).
Nah, don't need a calibration certificate! (Run, duck and hide!).