NTU Portable Device (IMAGE) Nanyang Technological University Caption The NTU device works in the field and requires just a few drops of a water sample into a disposable sensor cartridge to detect heavy metals at parts-per-billion precision. Credit NTU Singapore Usage Restrictions Mandatory credit to NTU Singapore License Licensed 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.