The CytoTracker Leukometer (IMAGE) Rutgers University Caption The CytoTracker Leukometer, indicating a level of white blood cells that falls within the "healthy" range. The portable device quickly delivers readings based on a single drop of blood. Credit RizLab Health Inc. Usage Restrictions None 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.