WSU has a new, open-access facility for the non-invasive optical screening of plants. The screening is completely computer-controlled and allows multiple daily measurements of the functional (photosynthetic) status of plants over a period of many days, utilizing fluorescence imaging. The facility is mainly designed for mutant screening but can also be used to monitor the stress response of plants. Many types of plants have been measured successfully, including wheat, tobacco, arabidopsis, and tomato.