CoCoRaHS is also educational to some. It helps people to understand decimal numbers and rain amounts.
I'm having a row with a non-CoCoRaHS rain observer over the amount of rain his gauge accumulated. He argues that he received 7.5 inches of rain when other observers in that county got 0.77", 0.78", 0.84", & 1.08". He may have a gauge similar to the 4 inch plastic professional that multiplies the amount. He sees seven and a half inches of water in the cylinder and thinks that it rained 7.5 inches at his house.
Another person accused me of being too scientific when I listed three days rain in numbers with two decimal places. I guess those 'complicated numbers' turned his brain to mush.