DEID equipment at Alta (IMAGE) University of Utah Caption Graduate student Ryan Szczerbinski examines instrumentation called a Differential Emissivity Imaging Disdrometer, or DEID, developed by University of Utah researchers and installed at Alta near the top of Little Cottonwood Canyon. The equipment measures the hydrometeor mass, size and density of snowflakes. Credit Tim Garrett, University of Utah Usage Restrictions fot use in news articles only License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.