The NASA Global Hydrology Resource Center (GHRC) DAAC published the Water Isotope System for Precipitation and Entrainment Research (WISPER) instrument micro article. WISPER measures condensed water contents and water vapor in clouds, along with water vapor isotopic abundances. This provides important information about the origin of air masses and possibly, microphysical processes. This micro article provides an overview of WISPER and its applications to support current and future dataset publications. The micro article is available at: https://ghrc.nsstc.nasa.gov/home/micro-articles/instrument-water-isotope-system-precipitation-and-entrainment-research-wisper