Caveat: Please don't use any of these results as gospel or for purchasing decisions. All of these are OLD. The Rainwise is at least 20 years old, the Davis is a free-standing one from a WMII with a black, (not silvered), tipper, and the TE one I got used in new condition in a goody box I bought from WxTEch. I had to make feet for it.
This is currently to see how different rain gauges act, and how well this calibration lash up functions.
After one run on the 3 current gauges...
The 8" Rainwise is pretty solid at 21-22 seconds between tips, increasing the last few tips as the water ran out.
The 6.5" Davis was ok, with tips in the middle if the run ranging from 15 to 19 seconds, with most being 16-17 seconds. As usual, the tips increased 21, 25, 28 at the ends of the run. I got a little thrown because beyond that, there are some 4661, 13162, 9772, 893, 620, 269, 120, etc tips in the log. Then I remembered that it rained after the calibration run and before I downloaded the log.
The 6" Texas Electronics gauge is a little more erratic. Mostly in the 15-17 second range, some 14s and then a few weird outlliers in the 29. 30, 32, 33 range. I think I'll check the tipper and then rerun it.
Another thing that bears inspection is to see if there is a pattern to the low and high times, like one side is not calibrated the same as the other.