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Although the kind that are given away free at farm shows are not usually 4-inch-diameter gauges, they are still relatively accurate. Accuracy of the manual rain gauges is, of course, user-dependent as accurate as the person checking the gauge, recording the data, emptying it, and resetting it.

It is an instrument used for determining the depth of precipitation that occurs over a unit area. Thus, it measures rainfall. … For the measurement of rainfall, the rain gauze should be placed 30 cm above the ground to prevent the splashing of rainwater.

5 gallons is about 2/3 of a cubic foot, and 2 inches is 1/6 of a foot. 2/3 cubic feet divided by 1/6 feet is 4 square feet, so 2 inches of rain falling over an area of 4 square feet is enough to fill a 5-gallon bucket.

As rainfall fills the tiny bucket, it becomes overbalanced and tips down, emptying itself as the other bucket pivots into place for the next reading. The action of each tipping event triggers a small switch that activates the electronic circuitry to transmit the count to the indoor console.

The 20 inch gauge is the norm throughout the National Weather Service. However, other agencies like the U.S. Forest Service often use the smaller gauge.

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