The bucket, 4" in diameter, measures each rain drop, displays it on the digital display with 3/8" numerals, and then empties itself. Simply place it outside on a hard, level surface and watch it record rainfall up to 99.999 in. Convenient one touch reset button lets you keep annual, monthly, or stormby-storm totals. The unit has no moving parts, gold-plated sensors for reliability, and is not damaged by freezing conditions.