Happy to report that the funnel & cowling turned my cave drip sensors into fairly robust logging rain gauges:

Field Report 2015-12-08: Rain Gauge Success at Rio Secreto

There are still a few design issues to work out regarding things like wind induced false positives, and spiders attempting to block the spouts, but overall the units have delivered great data that agrees with other local records.

These inexpensive units will become a vital part of the monitoring network as it grows.