rain gauge

The tube is a 2" I.D. tube I bought from Homedepot.com. Search for it in "dust collection". The area of the funnel is twice the area of the tube, so the inch scale is doubled. Assemble with super-glue, and test it to make sure it's water-tight. I recommend printing the bottom part of the funnel and cancelling the print, and test fitting it in the tube so you can make an adjustment if it doesn't fit your tube exactly.