Pulse Monitor (image) The Optical Society Caption To test their pulse monitoring technique, researchers built a device that mimics blood pulsing through a person's veins under their skin. Milk was pumped through the device to mimic the blood flow, and a type of plastic called Delrin was used to mimic skin's light-scattering properties. Pitured is the blood vessel mimic ("flow cell"). Credit Credit: Mahsa Nemati. Usage Restrictions None 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.