Calibration is equally important for planter box insecticide applicators. Follow the manufacturer's instructions for calibrating planters. There are different ways to calibrate a sprayer. The following steps are one of the methods you can use. Before calibrating, check your sprayer manufacturer's instructions.
Some sprayers require a special procedure for calibration.
You'll need a watch, measuring tape, measuring container graduated in ounces or tip tester, and flags or stakes for marking. Also, a pocket calculator may help with the math. Always start with a clean sprayer. Fill your sprayer tank about half full with clean water. Measure the distance in inches between nozzles.