Measures rainfall 1/100th inch increments. Self-emptying, tipping bucket design is exceptionally accurate, freeze-resistant and reliable. Meets the guidelines of the World Meteorological Organization. Accuracy is +/- 2% at < 2 in (5 cm) per hour.
Note: WatchDog rain collectors and SpecWare software can be programmed to record rainfall in either metric (mm) units or U.S. (in).