Q. What is this coil spring that came with my rain gauge?

It is a stainless steel filter which is included in the package. It’s aimed to stop leaves or bird droppings to avoid the obstruction of the cone hole.

The installation is simple: press the filter until the hook is inside the outlet hole and self -locked. The spring tension will keep the filter sit tight on the funnel.

Take out the filter hook from the edge to uninstall.
Hook the filter hook on the edge to install.

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