How do you measure dynamic pressure at the spray head? I have a PVC T connector with a pressure meter hung off the T. I can place it in line with the sprayer: Sprayer ||=Meter || <-- supply Thus, this allows the sprayer to function. The measurement is made while the sprayer is spraying. Alternately, I can plug the end of connector and use it to replace the sprayer. Plug ||=Meter || <--supply Which of these measurements would be considered the dynamic pressure at the head? Is that the measurement that would correspond to the pressure listed in the performance specs of the sprayer (e.g., Number 12 full sprayer shows 9 foot radius at 15 psi, 10 feet at 20 psi, 11 feet at 25 psi, and 12 feet at 30 psi).