Fingertip-sized spectrometer (IMAGE) Aalto University Caption A fingertip-sized on-chip spectrometer in the foreground compared to a commercial benchtop-size spectrometer in the background. Credit Aalto University Usage Restrictions May be used in publications related to this release with appropriate credit. 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.