I have the Rain BIrd sprinklers on my lawn and I am curious where to get information in understanding and interpreting the number that appear at the top of the nozzle (located at the lower half of the circular top). I understand that number may mean how far (distance), how wide (90, 180, 270, or 360 degrees), and other things. If there are reference charts or any websites, just wondering where I could get that info. Thanks
