Intermittent very slight drizzle over the past 24 hours has produced a
total of 0.9 mm in the manual rain gauge but the Davis Vantage Pro has
not registered anything. There's a lot of water stuck to the inside
walls of the funnel but the individual drops are too small to run down
to the bottom so the precipitation has not actually reached the tipping
bucket.

Does anyone know of a magic potion that can be applied to the inside of
the funnel to help even very small drops of water to run down?

Norman.
(delete "thisbit" twice to e-mail)
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Norman Lynagh Weather Consultancy
Chalfont St Giles
England