The TE-78-100 Atmospheric Precipitation Sampler is a useful tool for measuring the chemical composition of precipitation, which is important in monitoring and understanding the impacts of acid rain and other environmental contaminants. The use of two separate collection buckets allows for the differentiation between the wet deposition of pollutants in precipitation and the dry deposition of particulate matter. This information can be used to assess the sources of pollutants and their potential impacts on ecosystems and human health. The rain sensor ensures that precipitation is collected during rain events and that the collection buckets are protected during dry periods, optimizing the accuracy of the measurements. The sturdy aluminum construction of the APS ensures that it can withstand harsh environmental conditions and provide reliable data over extended periods of time.