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Rain gauge - Wikipedia
How is rainfall measured? | What does 1 mm rainfall mean?
Measuring rainfall – it’s easy and difficult at the same time
How Is Rainfall Measured? - Scientific American
Reading a Rain Gauge | Precipitation Education
How Do We Measure Rainfall? - Frontiers for Young Minds
How we measure rainfall - Met Office
How Does a Rain Gauge Measure Rainfall | The Weather Station
Weather: Measuring the Rain - Infoplease
7.8: Precipitation Measurement - Geosciences LibreTexts