This app makes sprayer calibration easy for those with older spraying equipment. You just have to select the correct type of nozzle, enter your main values and within minutes the app will automatically calibrate the other values for you. If you are not confident of the right pressure, spraying rate or tractor speed do not worry the app will take care of it all. It tracks the real time pesticide flow rate while you are driving. Real time tracking is more accurate if you use a precise GPS device. If you are using any of the old pesticide sprayers like amazone, hardi, rau, kverneland, horsch, lemken, matrot, mazzotti, vicon, challenger, knight, john deere, caffini, danfoil, dammann, etc. which has no computer control or possibility to set accurate spraying rate, this app will help you to calibrate your sprayer. It also has a product catalogue with all pesticides mixing instructions.